crown block 中文意思是什麼
crown block
解釋
拱頂石-
Our company to provide users with drilling and workover various models of the crown block
我公司為用戶提供修井和鉆井用各種型號的天車,規格齊全、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
配備完整的液壓氣動操作系統和雙重防碰天車,減輕工人的勞動強度,提高了操作安全性。
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