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hole type
oil 井型
tech. 钻孔类型; 空隙类型
hole type
: 40 phrases in 15 subjects
Agriculture3
Air defense1
Architecture2
Automobiles5
Chemistry1
Electronics2
Engineering geology2
Explosives and Explosive Ordnance Disposal4
General1
Hydroelectric power stations1
Metallurgy2
Mining1
Oil / petroleum4
Plastics1
Technology10

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