bighole drill 大孔径钻机
Introduced about the principles and features of ZD150 type bighole drill and discussed the main facts for influnce on the highly quality of the drill hole.
介绍了ZD150型大孔径钻机的工作原理及高质量钻孔的特征，论述了影响高质量钻孔的主要因素。
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