derrick substructure

常見(jiàn)例句

Have you fixed the derrick substructure in position?
井架底座固定好沒(méi)有？
The tong counter-weights must not rest on derrick sub-floor, derrick substructure sills.
不能讓大鉗平衡鉈靠到鉆臺(tái)下邊或井架底座上不起作用。
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The degree of reliability of rig derrick and substructure in different time is obtained by means of reliability evaluation of the zero failure data.
通過(guò)對(duì)石油鉆機(jī)井架、底座無(wú)故障數(shù)據(jù)的可靠性評(píng)定，求得了不同時(shí)間狀態(tài)下符合實(shí)際的可靠度。