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| 单位开关 | |||
| 组合开关; 单元开关 | |||
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unit switch : 34 phrases in 11 subjects |
| Automobiles | 1 |
| Aviation | 5 |
| Computer networks | 2 |
| Electric machinery | 2 |
| Electronics | 10 |
| Hydroelectric power stations | 2 |
| Information technology | 2 |
| Mining | 1 |
| Space | 1 |
| Technology | 7 |
| Telecommunications | 1 |