- rotary bit
- 旋转: revolve; gyrate; rotate; spi ...
- 钻井: borehole; well drilling
- 用: 40分钟跑完全程 run the course in 4 ...
- 钻头: boring crown; bore bit; dril ...
- 气体钻井用钻头: aerobit
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旋转钻井用钻头的英文
发音:
- rotary bit
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