derrick substructure

常见例句

雙語例句

• Have you fixed the derrick substructure in position?
  井架底座固定好沒有？
• The tong counter-weights must not rest on derrick sub-floor, derrick substructure sills.
  不能讓大鉗平衡鉈靠到鑽台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.
  通過對石油鑽機井架、底座無故障數據的可靠性評定，求得了不同時間狀態下符郃實際的可靠度。
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