derrick substructure

常见例句

双语例句

• Have you fixed the derrick substructure in position?
  井架底座固定好没有？
• The tong counter-weights must not rest on derrick sub-floor, derrick substructure sills.
  不能让大钳平衡铊靠到钻台下边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.
  通过对石油钻机井架、底座无故障数据的可靠性评定，求得了不同时间状态下符合实际的可靠度。
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