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jackbit | |||
core bit | |||
core drill bit; coring bit; jack bit | |||
hollow bit | |||
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hollow bit |
岩 心钻头 : 14 phrases in 8 subjects |
Architecture | 1 |
Drilling | 1 |
Earth sciences | 2 |
Explosives and Explosive Ordnance Disposal | 1 |
General | 2 |
Metallurgy | 2 |
Oil / petroleum | 2 |
Technology | 3 |