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干线型肝硬变（pipe stem cirrhosis）
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A heavy，thick-walled tube，usually steel，used between the drill pipe and the bit in the drill stem to weight the bit in order to improve its performance is called a ______.A.heavy-walled drill pipeB.tool jointC.down hole toolD.drill collar
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单选题Which of the followings is not an indication of a bad maintenance?（）A
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单选题What is a spill pipe?（）A
A drainage pipe that carries rain or spray from an upper deck to a lower deckB
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考题
名词解释题干线型肝硬变（pipe stem cirrhosis）
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