- feed of drill
- 钻头: boring crown; bore bit; dril ...
- 进程: course; proceeding; process; ...
- 钻头进尺: bit footage; feet per bit; footage per bit; headway per drill bit
- 钻头进尺数: bit footage; feed range
- 每个钻头进尺: footage drilled per bit; footage per bit; headway per drill bit; production per point
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