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开关 位置 : 50 phrases in 11 subjects |
Air defense | 1 |
Automobiles | 14 |
Aviation | 4 |
Drilling | 2 |
Electric machinery | 1 |
Electronics | 17 |
General | 1 |
Hydroelectric power stations | 2 |
Rail transport | 3 |
Technology | 4 |
Telecommunications | 1 |