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位置开关: 51 phrases in 12 subjects |
Air defense | 1 |
Automobiles | 15 |
Aviation | 3 |
Drilling | 2 |
Electric machinery | 1 |
Electronics | 17 |
General | 1 |
Hydroelectric power stations | 2 |
Navigation | 1 |
Rail transport | 3 |
Technology | 4 |
Telecommunications | 1 |