... 终孔直径 End hole caliber 钻杆直径 Drill pipe diameter 钻孔倾角 Drilling angle ...
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drill pipe diameter
钻杆直径
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Inside the riser pipe is a space about half a meter in diameter, large enough to hold the spinning drill pipe and bit and to allow the return flow of drilling fluid.
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