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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 |
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