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岩心钻头
gen. jackbit
coal. core bit
met. core drill bit; coring bit; jack bit
oil hollow bit
岩心 〔取心〕钻头
met. hollow bit
岩心 钻头
: 14 phrases in 8 subjects
Architecture1
Drilling1
Earth sciences2
Explosives and Explosive Ordnance Disposal1
General2
Metallurgy2
Oil / petroleum2
Technology3

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