read.pudn.comread.pudn.com/downloads723/doc/fileformat/2895632/GB T 27930-2015 .pdf · ICS 29.200 K...
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read.pudn.comread.pudn.com/downloads723/doc/fileformat/2895632/GB T 27930-2015 .pdf · ICS 29.200 K 81 GB/T 27930—2015 GB/T 27930—2011 Communication protocols between off-board