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[11]一种用于钻探的扩孔钻具及扩孔方法
[12]liuchun , 张浩峰,丁前程,薛劲,一种瓦斯抽采钻孔密封性检测装置及检测方法
[13]刘春 , 周福宝,满忠毅,一种声波监测瓦斯抽采管道堵塞的方法
total13 2/2
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