expansive bit是什么意思 expansive bit怎么读
expansive bit的英文翻译是什么意思，词典释义与在线翻译
Noun:- a bit with a cutting blade that can be adjusted to different sizes
expansive bit的用法和样例
- A good way to help you to improve drilling technique is to use a jet bit.
能帮助你们改进钻井技术的一种好方法是使用喷射式钻头。
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