The results show that: the whole bit wear process can be divided into three phases;

发现钻头的整个磨损过程可分为3个阶段；

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Properly press the packing gland in case of a little bit wear and replace it in case of too much wear.

填料磨损时可适当压紧填料压盖，若磨损过多应予更换。

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Field tests also show that the self-resonating cavitation nozzle is highly effective in reducing bit wear, increasing drilling footage and drilling speed.

现场试验同样证实设计的自振空化射流喷嘴在保护钻头、减少钻头磨损及增加进尺、提高机械钻速方面有显著作用。

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Each time I boarded the plane to New York City for meetings, I would subconsciously tone down the southern twang, walk a bit faster and wear more black.

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Occasionally the A40s are a bit too bulky to wear around my neck so we can talk without headsets.

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Wear it a little bit, right?

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