crown block meaning in English
拱顶石
冠轮
起重定滑轮
天车
Examples
- Our company to provide users with drilling and workover various models of the crown block
我公司为用户提供修井和钻井用各种型号的天车，规格齐全、配套完善。 - The hydraulic pneumatic operation system and dual crown block saver which are equipped completely can alleviate worker ' s labour intensity and raise operating security
配备完整的液压气动操作系统和双重防碰天车，减轻工人的劳动强度，提高了操作安全性。