crown block造句

• 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。