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保护电路 : 79 phrases in 16 subjects |
Agriculture | 1 |
Air defense | 12 |
Automobiles | 4 |
Aviation | 6 |
Electric machinery | 2 |
Electronics | 12 |
General | 1 |
Geophysics | 2 |
Hydroelectric power stations | 1 |
Information technology | 2 |
Metallurgy | 2 |
Rail transport | 6 |
Space | 4 |
Technology | 21 |
Telecommunications | 2 |
Wind Energy | 1 |