derrick mast

常見例句

雙語例句

• Do not throw objects off the floor, mast or derrick.
  不允許從鉆臺上或井架上，往下亂扔?xùn)|西。
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• Tools carried into the derrick or mast should be secured to the body.
  帶到井架上的工具應(yīng)當綁在身上。
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• The frame of mast derrick that is designed for hydraulic wheel tractor hoist adopt welding of armor plate, its section is oblong armor plate, and its material is HG60.
  為滿足液壓輪式通井機的使用要求而設(shè)計的桅桿式井架采用板焊結(jié)構(gòu)， 主體截面為長方形的方形鋼， 材料為HG60。
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