Treatment and Prevention on Assembly Dropdown in Large Diameter Borehole Construction
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杨宗仁,赵建秋,张西坤.大直径钻孔施工掉钻事故的处理及预防[J].钻探工程,2008,35(5):64-66.YANG Zong-ren, ZHAO Jian-qiu, ZHANG Xi-kun. Treatment and Prevention on Assembly Dropdown in Large Diameter Borehole Construction[J]. Drilling Engineering, 2008,35(5):64-66.
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