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不规则炮孔钻孔时，因钻机振动等原因造成钻孔不顺直、孔径或大或小的炮孔
expl. ravel-ed hole
不规则炮孔钻孔时,因钻机振动等原因造成钻孔不顺直、孔径或大或小的炮孔
expl. irregular hole

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