According to the cause of its wear and tear, some advice on the design and make of a small drill bit is presented in the paper.
文章根据小钻头破损的原因，对小钻头的设计、制造及其使用提出一些改进意见及措施。
According to the cause of its wear and tear, some advice on the design and make of a small drill bit is presented in the paper.
文章根据小钻头破损的原因，对小钻头的设计、制造及其使用提出一些改进意见及措施。
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