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系统测验
agric.
line test
系统测验:
48 phrases
in 13 subjects
Air defense
1
Aviation
12
Business
1
Communications
1
Earth sciences
8
Electronics
7
Explosives and Explosive Ordnance Disposal
1
Hydroelectric power stations
2
Mining
1
Rail transport
1
Space
8
Technology
4
Telecommunications
1
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