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The spiral drill collars are being tried to use.
一套新钻机正在这个井场安装。
youdao
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They measured the length of drill collars yesterday.
他们昨天仗量了钻杆和钻链的长度。
youdao
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The drill collars must be made of nonmagnetic material.
钻铤必须是由非磁性物质做成的。
youdao
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The drill collars must be made of nonmagnetic material.
钻铤必须是由非磁性物质做成的。
youdao