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分级控 制 : 28 phrases in 15 subjects |
Agriculture | 1 |
Air defense | 1 |
Automobiles | 1 |
Aviation | 1 |
Computer networks | 1 |
Electronics | 4 |
Information technology | 3 |
Mathematics | 1 |
Metallurgy | 1 |
Refrigeration | 1 |
Space | 2 |
Sports | 1 |
Technology | 6 |
Telecommunications | 2 |
Wind Energy | 2 |