Test Environmental Engineering

7/30/2019 Test Environmental Engineering

1/32

The removal involves wetting the particles by the scrubbing liquid in

Seleccione una respuesta.

a. cotton bag filters

b. electrostatic precipitators

c. cyclons

d. particle washers

Question 2

Puntos: --/1

Venturi washers...


a. are very expensive (high capital costs)

b. emit secondary particles

c. have a simultaneous washing capacity for particles and gasesd. avoid corrosion problems

Question 3

Puntos: --/1

The solid materials used as adsorbents are...


a. ozone and CFCs

b. usually very porous

c. deactivated by treatment with hot air

d. are usually very porous, with extremely low surface-to-volume ratios

Question 4

Puntos: --/1

Which molecule in the atmosphere protects surface creatures from UV radiation?


a. oxygen

b. ozone

c. nitrogen

d. water vapor

Question 5

Puntos: --/1

Select two of the most important greenhouse gases in the atmosphere


a. oxygen, nitrogen

b. carbon dioxide, water vapor


2/32


3/32

d. the infrarred radiation emitted by the surface

Question 10

Puntos: --/1

The weather conditions that contribute to very cold surface tempaeratures are


a. all of the above

b. no wind

c. night time

d. clear skies

Question 11

Puntos: --/1

Radiation from the sun enters the atmosphere and it is absorbed by the earths surface.

The earths surface then re-radiates this energy. How is this re-radiated energy

described?


a. shortwave

b. reflected

c. ultraviolet

d. longwave

Question 12

Puntos: --/1

A plume fumigates...


a. far away from the stack in stable atmospheres

b. at the same distance, atmospheric stability does not influence the transport

c. far away from the stack in unstable atmospheresQuestion 13

Puntos: --/1

Is it important the particle resistivity on an electrostatic precipitator?


a. yes, they should be good conductors

b. it is not

c. yes, on a given range of resistivitiesQuestion 14


4/32

Puntos: --/1

On a box model, the height of the mixing layer...


a. is proportional to the surface of the box

b. it has a constant value of 1500 m

c. defines the air volume where we are going to calculate the mass balance

d. it is not important at all

Question 15

Puntos: --/1

For high temperature smoke, what would be the appropiate pretreatment?



b. cyclon

c. adsorption

Question 16

Puntos: --/1

How long is the VOCs lifetime in the troposphere?


a. a few hours

b. as they are very reactive, a few minutes

c. between few minutes and hundreds of days

Question 17

Puntos: --/1

Why are so important radicals in atmospheric chemistry?


a. because they are toxic

b. they are not important

c. because they are highly reactive

Question 18

Puntos: --/1

The places to which pollutants disappear from the air are...


a. precursors

b. sources

c. sinks


5/32

Question 19

Puntos: --/1

Injection into the atmosphere of fine particulate by volcanoes is a ...


a. city scale air pollution problem

b. regional scale air pollution problem

c. global air pollution problem

Question 20

Puntos: --/1

The Sulphur trioxide ...


a. It is produced together with SO2 exclusively by natural sources

b. It reacts quickly producing H2SO4

c. has an extremely long lifetime

Question 21

Puntos: --/1

Nitrous oxides major sources are:


a. energy-related, industrial and waste management activities

b. all the above

c. anaerobic processes from a wide variety of biological sources in soil and water

d. fertilizer applicationQuestion 22

Puntos: --/1

The carbon monoxide is mainly removed from the atmosphere


a. by wet scavenging

b. by reaction with particulate matter

c. by reaction with hydroxyl radical

Question 23

Puntos: --/1Small colloidal particles are mainly subject to


a. diffussion processes

b. dry deposition

c. wet deposition

Question 24

Puntos: --/1

The most significant feature of atmospheric chemistry is the occurrence of...

Seleccione una respuesta.a. photodissociation


6/32

b. neutralization reactions

c. fluorescence reactions

Question 25

Puntos: --/1

NO3 radicals are ...Seleccione una respuesta.

a. the "currency of daytime atmospheric chemical phenomena

b. inert radicals in the troposphere

c. important intermediates in nighttime atmospheric chemistry

Question 26

Puntos: --/1

Sulphates are formed by


a. The homogenous oxidation of SO2 by free radicals

b. Heterogeneous oxidation of sulphur compounds

c. both of them

d. none of them

Question 27

Puntos: --/1

The convective turbulence


a. does not exist

b. is caused by the different heating and/or cooling of surfaces and air masses

c. is caused by physical obstructions to normal flow such as hills, mountains,

coasts, buildingsand/or trees

Question 28

Puntos: --/1

The rate of cooling or warming of an air parcel forced to rise or descend is about


a. -5.76 C/km

b. -9.76 C/km

c. -190.76 C/m

Question 29

Puntos: --/1

When the atmosphere enhances vertical motions, it is called


a. stable

b. unstablec. isotherm


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d. neutral

Question 30

Puntos: --/1

In an stable environment, the smoke plumes have the following shape:


a. fanning

b. coning

c. looping

d. fumigation

Question 31

Puntos: --/1

Pure advection models


a. assume uniform mixing throughout the volume of a 3D box are useful forestimating concentrations

b. are based on the analysis and statistical treatment of historical databases

c. model the motion of the parcels as a random process

Question 32

Puntos: --/1

Buoyancy rise is also called


a. thermal rise because the most common cause of lower density is lower

temperature.b. thermal rise because the most common cause of lower density is higher

temperature.

c. momentum rise

Question 33

Puntos: --/1

a cyclon...


a. is a continuous inertial separator

b. is not a reliable technology

c. is extremely expensive compared to other devices (ESP, baghouses)

d. has a sophisticated design

Question 34

Puntos: --/1

The selection of the bagfilters material depends on


a. gas stream temperatureb. gas streams properties and composition


8/32

c. physical and chemical properties of the particles to be filtered

d. all the above

Question 35

Puntos: --/1

Electrostatic precipitators...


a. can not easily handle high-temperature gases

b. Their initial cost is the lowest of any particulate collection system

c. have an extremely high collection efficiency if they are operated properly


9/32





c. cyclons

d. particle washers

Correcto

Puntos para este envo: 1/1.

Question 2

Puntos: 1/1

Venturi washers...




c. have a simultaneous washing capacity for particles and gases

d. avoid corrosion problems

Correcto


Question 3

Puntos: 0.9/1



a. ozone and CFCs




Correcto

Puntos para este envo: 1/1. Con las penalizaciones previas esto da como resultado

0.9/1.Question 4

Puntos: 1/1



a. oxygen

b. ozone

c. nitrogen

d. water vapor

CorrectoPuntos para este envo: 1/1.


10/32

Question 5

Puntos: 1/1


Seleccione una respuesta.a. oxygen, nitrogen


c. oxygen, sulphur dioxide

d. nitrogen dioxide, carbon monoxide

Correcto


Question 6

Puntos: 0.9/1

What is the approximate standard atmospheric pressure at sea level in millibars?


a. 1000

b. 29

c. 14.8

d. 100

CorrectoPuntos para este envo: 1/1. Con las penalizaciones previas esto da como resultado

0.9/1.Question 7

Puntos: 1/1

In what layer of the atmosphere does weather occur?


a. thermosphere

b. stratosphere

c. troposphere

d. mesosphere

Correcto


Question 8

Puntos: 1/1

If the temperature of an object increases, the amount of radiation the object emits



11/32

a. decreases

b. increases but emisionss wavelenght decreases

c. remains the same

d. increases and emisionss wavelenght increases tooCorrecto


Question 9

Puntos: 0.8/1

the greenhouse effect is due to


a. conduction and evapotransiration

b. the infrarred radiation emitted by the atmosphere and absorbed by the surface

c. the solar radiation absorbed by the surface


Correcto


0.8/1.Question 10

Puntos: 0.9/1



a. all of the above

b. no wind

c. night time

d. clear skies

Correcto

Puntos para este envo: 1/1. Con las penalizaciones previas esto da como resultado0.9/1.Question 11

Puntos: 1/1



described?


a. shortwave

b. reflected


12/32

c. ultraviolet

d. longwave

Correcto


Question 12Puntos: 0.8/1





c. far away from the stack in unstable atmospheres


0.8/1.

Question 13

Puntos: 1/1




b. it is not

c. yes, on a given range of resistivities

Correcto


Question 14

Puntos: 1/1







Correcto


Question 15

Puntos: 1/1



13/32



b. cyclon

c. adsorption

Correcto


Question 16

Puntos: 1/1



a. a few hours

b. as they are very reactive, a few minutesc. between few minutes and hundreds of days

Correcto


Question 17

Puntos: 1/1




b. they are not importantc. because they are highly reactive

Correcto


Question 18

Puntos: 1/1



a. precursors

b. sources

c. sinks

Correcto


Question 19

Puntos: 1/1







14/32

Correcto


Question 20

Puntos: 1/1


Seleccione una respuesta.a. It is produced together with SO2 exclusively by natural sources



Correcto


Question 21

Puntos: 1/1


Seleccione una respuesta.a. energy-related, industrial and waste management activities

b. all the above


d. fertilizer application

Correcto


Question 22

Puntos: 1/1

The carbon monoxide is mainly removed from the atmosphereSeleccione una respuesta.




Correcto


Question 23

Puntos: 1/1

Small colloidal particles are mainly subject toSeleccione una respuesta.


b. dry deposition

c. wet deposition

Correcto


Question 24

Puntos: 1/1

The most significant feature of atmospheric chemistry is the occurrence of...Seleccione una respuesta.


15/32

a. photodissociation




Question 25

Puntos: 1/1

NO3 radicals are ...





Correcto


Question 26

Puntos: --/1




b. Heterogeneous oxidation of sulphur compounds

c. both of them

d. none of themQuestion 27

Puntos: 1/1



a. does not exist




Correcto


Question 28

Puntos: 1/1



a. -5.76 C/km

b. -9.76 C/km

c. -190.76 C/m

Correcto


16/32


Question 29

Puntos: 1/1

When the atmosphere enhances vertical motions, it is called


a. stable

b. unstable

c. isotherm

d. neutral

Correcto


Question 30

Puntos: 1/1

In an stable environment, the smoke plumes have the following shape:


a. fanning

b. coning

c. looping

d. fumigation

Correcto


Question 31

Puntos: 1/1Pure advection models


a. assume uniform mixing throughout the volume of a 3D box are useful for

estimating concentrations

b. are based on the analysis and statistical treatment of historical databases


Correcto


Question 32

Puntos: 1/1




temperature.

b. thermal rise because the most common cause of lower density is higher

temperature.

c. momentum rise

Correcto

Puntos para este envo: 1/1.Question 33


17/32

Puntos: 1/1

a cyclon...


a. is a continuous inertial separator




Correcto


Question 34

Puntos: 1/1

The selection of the bagfilters material depends on


a. gas stream temperature

b. gas streams properties and composition


d. all the above

Correcto


Question 35

Puntos: 1/1






Correcto



18/32





c. cyclons

d. particle washers

Correcto


Historial de respuestas

# Accin Respuesta Fecha Puntuacin bruta Calificacin

2 Calificacin particle washers22:54:22 on

5/03/121 1

3 Cerrar particlewashers

23:14:44 on5/03/12

1 1

Question 2

Puntos: 1/1

Venturi washers...




c. have a simultaneous washing capacity for particles and gases

d. avoid corrosion problems

Correcto




2 Calificacin

have a simultaneous

washing capacity for

particles and gases

22:54:26

on 5/03/121 1

3 Cerrar

have a simultaneous

washing capacity forparticles and gases

23:14:44on 5/03/12

1 1

Question 3

Puntos: 0.9/1



a. ozone and CFCs



http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778522&number=1http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778522&number=1http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778523&number=2http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778523&number=2http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778523&number=2http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778522&number=1


19/32

Correcto


0.9/1.



2 Calificacin

are usually very

porous, with extremely

low surface-to-volume

ratios

22:54:32

on 5/03/120 0

3 Calificacin usually very porous22:54:42

on 5/03/121 0.9

4 Cerrar usually very porous23:14:44

on 5/03/121 0.9

Question 4Puntos: 1/1



a. oxygen

b. ozone

c. nitrogen

d. water vaporCorrecto




2 Calificacin ozone 22:54:53 on 5/03/12 1 1

3 Cerrar ozone 23:14:44 on 5/03/12 1 1

Question 5

Puntos: 1/1



a. oxygen, nitrogen


c. oxygen, sulphur dioxide

d. nitrogen dioxide, carbon monoxide

Correcto


http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778525&number=3http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778525&number=3http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778526&number=3http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778526&number=3http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778527&number=4http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778527&number=4http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778527&number=4http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778526&number=3http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778525&number=3


20/32


2 Calificacincarbon dioxide,

water vapor

22:54:58 on

5/03/121 1

3 Cerrarcarbon dioxide,water vapor

23:14:44 on5/03/12 1 1

Question 6

Puntos: 0.9/1

What is the approximate standard atmospheric pressure at sea level in millibars?


a. 1000

b. 29

c. 14.8

d. 100

Correcto


0.9/1.Historial de respuestas


1 Calificacin 100 23:04:57 on 5/03/12 0 0

2

Calificacin 1000 23:05:12 on 5/03/12 1 0.9

3 Cerrar 1000 23:14:44 on 5/03/12 1 0.9

Question 7

Puntos: 1/1

In what layer of the atmosphere does weather occur?


a. thermosphere

b. stratosphere

c. troposphere

d. mesosphere

Correcto




2 Calificacin troposphere 22:59:13 on 5/03/12 1 1

3 Cerrar troposphere 23:14:44 on 5/03/12 1 1

Question 8
http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778529&number=5http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778529&number=5http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778595&number=6http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778595&number=6http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778596&number=6http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778596&number=6http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778569&number=7http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778569&number=7http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778569&number=7http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778596&number=6http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778595&number=6http://moodle3.ehu.es/mod/quiz/reviewquestion.php?state=1778529&number=5


21/32

Puntos: 1/1

If the temperature of an object increases, the amount of radiation the object emits


a. decreases

b. increases but emisionss wavelenght decreases

c. remains the same

d. increases and emisionss wavelenght increases too

Correcto




2 Calificacinincreases butemisionss

wavelenght decreases

22:59:46 on

5/03/121 1

3 Cerrar

increases but

emisionsswavelenght

decreases

23:14:44on 5/03/12

1 1

Question 9

Puntos: 0.8/1

the greenhouse effect is due to


a. conduction and evapotransiration

b. the infrarred radiation emitted by the atmosphere and absorbed by the surface

c. the solar radiation absorbed by the surface



0.8/1.



2 Calificacinthe infrarred radiation

emitted by the surface

23:00:57

on 5/03/120 0

4 Calificacinthe solar radiation

absorbed by the surface

23:10:13

on 5/03/120 0

5 Calificacin the infrarred radiationemitted by the

23:10:24on 5/03/12

1 0.8


22/32

atmosphere and

absorbed by the surface

6 Cerrar

the infrarred

radiation emitted by

the atmosphere andabsorbed by the

surface

23:14:44

on 5/03/12 1 0.8

Question 10

Puntos: 0.9/1



a. all of the above

b. no wind

c. night time

d. clear skies

Correcto


0.9/1.



2 Calificacin night time 23:08:42 on5/03/12 0 0

3 Calificacin all of the above23:09:16 on

5/03/121 0.9

4 Cerrarall of theabove

23:14:44 on5/03/12

1 0.9

Question 11

Puntos: 1/1



described?


a. shortwave

b. reflected

c. ultraviolet

d. longwave



23/32



2 Calificacin longwave 23:05:40 on 5/03/12 1 1

3 Cerrar longwave 23:14:44 on 5/03/12 1 1

Question 12

Puntos: 0.8/1





c. far away from the stack in unstable atmospheres

Correcto


0.8/1.



2 Calificacin

far away from the stack

in unstable

atmospheres

22:53:04

on 5/03/120 0

3 Calificacin

at the same distance,

atmospheric stability

does not influence the

transport

23:12:25

on 5/03/120 0

4 Calificacinfar away from the stack

in stable atmospheres

23:12:35

on 5/03/121 0.8

5 Cerrar

far away from thestack in stable

atmospheres

23:14:44

on 5/03/121 0.8

Question 13

Puntos: 1/1




b. it is not

c. yes, on a given range of resistivities

Correcto

Puntos para este envo: 1/1.Historial de respuestas


24/32


2 Calificacinyes, on a given range

of resistivities

22:52:56 on

5/03/121 1

3 Cerraryes, on a givenrange of resistivities

23:14:44 on5/03/12 1 1

Question 14

Puntos: 1/1







Correcto




2 Calificacin

defines the air volume

where we are going to

calculate the mass

balance

22:52:48

on 5/03/121 1

3 Cerrar

defines the air volumewhere we are going to

calculate the massbalance

23:14:44

on 5/03/121 1

Question 15

Puntos: 1/1




b. cyclon

c. adsorption

Correcto




2 Calificacin cyclon 22:52:37 on 5/03/12 1 1


25/32

3 Cerrar cyclon 23:14:44 on 5/03/12 1 1

Question 16

Puntos: 1/1



a. a few hours

b. as they are very reactive, a few minutes

c. between few minutes and hundreds of days

Correcto




2 Calificacinbetween few minutes

and hundreds of days

22:52:30 on

5/03/121 1

3 Cerrar

between few

minutes andhundreds of days

23:14:44 on5/03/12

1 1

Question 17

Puntos: 1/1




b. they are not important

c. because they are highly reactive

Correcto




2

Calificacin

because they are

highly reactive

22:52:21 on

5/03/12 1 1

3 Cerrarbecause they are

highly reactive

23:14:44 on

5/03/121 1

Question 18

Puntos: 1/1



a. precursors

b. sources

c. sinks


26/32

Correcto




2

Calificacin sinks 22:52:14 on 5/03/12 1 1

3 Cerrar sinks 23:14:44 on 5/03/12 1 1

Question 19

Puntos: 1/1






Correcto




2 Calificacinglobal air pollution

problem

22:52:07 on

5/03/121 1

3 Cerrarglobal air

pollution problem

23:14:44 on

5/03/121 1

Question 20Puntos: 1/1



a. It is produced together with SO2 exclusively by natural sources



Correcto


Historial de respuestas# Accin Respuesta Fecha Puntuacin bruta Calificacin

2 CalificacinIt reacts quickly

producing H2SO4

22:51:42 on

5/03/121 1

3 CerrarIt reacts quicklyproducing H2SO4

23:14:44 on5/03/12

1 1

Question 21

Puntos: 1/1


Seleccione una respuesta.a. energy-related, industrial and waste management activities


27/32

b. all the above


d. fertilizer application




2 Calificacin all the above 22:51:25 on 5/03/12 1 1

3 Cerrar all the above 23:14:44 on 5/03/12 1 1

Question 22

Puntos: 1/1

The carbon monoxide is mainly removed from the atmosphere





Correcto




2 Calificacin by reaction withhydroxyl radical

22:50:46 on5/03/12

1 1

3 Cerrarby reaction withhydroxyl radical

23:14:44 on5/03/12

1 1

Question 23

Puntos: 1/1

Small colloidal particles are mainly subject to



b. dry deposition

c. wet deposition

Correcto




1 Calificacindiffussion

processes

22:50:37 on

5/03/121 1

2 Cerrar diffussionprocesses 23:14:44 on5/03/12 1 1


28/32

Question 24

Puntos: 1/1

The most significant feature of atmospheric chemistry is the occurrence of...


a. photodissociation



Correcto




2 Calificacin photodissociation22:50:19 on

5/03/121 1

3 Cerrar photodissociation23:14:44 on5/03/12

1 1

Question 25

Puntos: 1/1

NO3 radicals are ...





Correcto




2 Calificacin

important

intermediates in

nighttime atmospheric

chemistry

22:50:10

on 5/03/121 1

3 Cerrar

important

intermediates innighttimeatmospheric

chemistry

23:14:44on 5/03/12

1 1

Question 26

Puntos: 1/1




b. Heterogeneous oxidation of sulphur compoundsc. both of them


29/32

d. none of them

Correcto


Question 27

Puntos: 1/1



a. does not exist




Correcto

Puntos para este envo: 1/1.Historial de respuestas


2 Calificacin

is caused by the

different heating and/or

cooling of surfaces and

air masses

22:49:42

on 5/03/121 1

3 Cerrar

is caused by the

different heating

and/or cooling ofsurfaces and air

masses

23:14:44

on 5/03/12 1 1

Question 28

Puntos: 1/1



a. -5.76 C/km

b. -9.76 C/km

c. -190.76 C/mCorrecto




2 Calificacin -9.76 C/km 22:49:34 on 5/03/12 1 1

3 Cerrar -9.76 C/km 23:14:44 on 5/03/12 1 1

Question 29

Puntos: 1/1

When the atmosphere enhances vertical motions, it is calledSeleccione una respuesta.


30/32

a. stable

b. unstable

c. isotherm

d. neutralCorrecto




2 Calificacin unstable 22:49:22 on 5/03/12 1 1

3 Cerrar unstable 23:14:44 on 5/03/12 1 1

Question 30

Puntos: 1/1

In an stable environment, the smoke plumes have the following shape:Seleccione una respuesta.

a. fanning

b. coning

c. looping

d. fumigation

Correcto


Historial de respuestas# Accin Respuesta Fecha Puntuacin bruta Calificacin

2 Calificacin fanning 22:49:13 on 5/03/12 1 1

3 Cerrar fanning 23:14:44 on 5/03/12 1 1

Question 31

Puntos: 1/1

Pure advection models


a. assume uniform mixing throughout the volume of a 3D box are useful for

estimating concentrationsb. are based on the analysis and statistical treatment of historical databases


Correcto




2

Calificacin

assume uniform mixing

throughout the volume

of a 3D box are usefulfor estimating

22:49:03

on5/03/12 1 1


31/32

concentrations

3 Cerrar

assume uniformmixing throughout the

volume of a 3D box

are useful forestimating

concentrations

23:14:44on

5/03/12

1 1

Question 32

Puntos: 1/1




temperature.

b. thermal rise because the most common cause of lower density is higher

temperature.c. momentum rise

Correcto




2 Calificacin

thermal rise because the

most common cause of

lower density is higher

temperature.

22:48:43

on

5/03/12

1 1

3 Cerrar

thermal rise because

the most common

cause of lower densityis higher temperature.

23:14:44on

5/03/12

1 1

Question 33

Puntos: 1/1

a cyclon...

Seleccione una respuesta.a. is a continuous inertial separator




Correcto



# Accin Respuesta Fecha Puntuacin bruta Calificacin2 Calificacin is a continuous 22:48:24 on 1 1


32/32

inertial separator 5/03/12

3 Cerraris a continuousinertial separator

23:14:44 on5/03/12

1 1

Question 34

Puntos: 1/1The selection of the bagfilters material depends on


a. gas stream temperature

b. gas streams properties and composition


d. all the above

Correcto




2 Calificacin all the above 22:48:13 on 5/03/12 1 1

3 Cerrar all the above 23:14:44 on 5/03/12 1 1

Question 35

Puntos: 1/1






Correcto




1 Calificacin

have an extremely high

collection efficiency if

they are operated

properly

22:47:36

on 5/03/121 1

2 Cerrar

have an extremelyhigh collection

efficiency if they areoperated properly

23:14:44

on 5/03/121 1

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