大口径钻头
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large-diameter DTH hammer bit 大直径钻头
large diameter diamond core bit 大口径金刚石钻头
large diameter combined cone bit 大口径组合牙轮钻头
large diameter bit
大直径钻头
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.
FORBES: The delicate art of sucking up
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