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dril. attenuator; block up
oil packoff
封隔: 475 phrases in 20 subjects
Automobiles2
Chemistry3
Compressors1
Drilling100
Earth sciences2
Electronics12
Engineering geology4
Explosives and Explosive Ordnance Disposal1
General1
Geology1
Geophysics1
Hydroelectric power stations2
International trade1
Mechanics6
Mining47
Nautical1
Oil / petroleum193
Space1
Technology95
Wind Energy1

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