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四相 | |||
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四相的 |
four phase : 32 phrases in 12 subjects |
Air defense | 1 |
Business | 1 |
Electric machinery | 3 |
Electronics | 6 |
Information technology | 1 |
Metallurgy | 1 |
Rail transport | 2 |
Space | 1 |
Technology | 11 |
Telecommunications | 3 |
United Nations | 1 |
Wind Energy | 1 |