... chatter marks 慧 check borehole 检验钻孔 check sample 校对试样 ...
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check k borehole 检验钻孔
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Operation requirements of vertical borehole drilling, found the process of drill pipe shakes or difficult drilling, stones and other foreign bodies may be encountered, should immediately stop check.
操作时要求钻杆垂直，钻孔过程中如发现钻杆摇晃或难钻进时，可能是遇到石块等异物，应立即停机检查。
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