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人工试验
busin. labor test
人工试验: 31 phrases in 15 subjects
Automobiles5
Aviation1
Business2
Chemistry2
Earth sciences1
Ecology1
Electricity generation1
Explosives and Explosive Ordnance Disposal1
Geophysics1
International trade1
Metallurgy1
Plastics1
Polymers1
Space1
Technology11

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