Crane is a kind of bird with very long legs and neck.鹤是一种腿和脖子都很长的鸟.A crane was already unloading crates and pallets.起重机已经开始卸载木箱和托盘了。It is used for the crane slewing bearing.这是用于起重机的回转支承.sluing the boom of a crane.转动一台起重机...
Ethylene and trans - dichloroethylene are both inactive in the infra - red in this region.乙烯和反式二氯乙烯在红外光谱的这个区域都无活性.Plasma - polymerization of ethylene gives films of complex, uncertain structure.乙烯的等离子聚合得到复杂的, 无固定结构的薄膜.In...