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| 反循环冲洗钻进冲洗液由孔口密封装置压人孔壁与钻具间的环形空隙，经孔底携带岩屑〈粉〉，然后从钻具内孔返回地表的钻进技术 | |||
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reversed circulation drilling : 1 phrase in 1 subject |
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