HUMAN NECESSITIES A
PERFORMING OPERATIONS; TRANSPORTING B
CHEMISTRY; METALLURGY C
TEXTILES; PAPER D
FIXED CONSTRUCTIONS E
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING ENGINES OR PUMPS F
PHYSICS G
ELECTRICITY H
GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS[N0403] Y
这些有什么用,求教谢谢! |
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