GB/T 35060.4-2021
General specification of shearer—Part 4: Electric control system 滚筒采煤机通用技术条件 第4部分:电气控制系统 |
GB/T 39963-2021
Technical specification on C80~C100 concrete shaft lining applied in vertical freezing shaft 立井冻结法凿井井壁应用C80~C100混凝土技术规程 |
GB/T 39827.1-2021
Plastics -- Post-consumer poly(ethylene terephthalate) (PET) bottle recyclates -- Part 1: Designation system and basis for specifications 塑料 用过的聚对苯二甲酸乙二醇酯(PET)瓶回收物 第1部分:命名系统和分类基础 |
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