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| system level | |||
| 系统电平: 23 phrases in 12 subjects |
| Automobiles | 1 |
| Aviation | 3 |
| Communications | 1 |
| Electric machinery | 1 |
| Electronics | 6 |
| Geophysics | 1 |
| Hydroelectric power stations | 3 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Reliability | 2 |
| Technology | 1 |
| Telecommunications | 2 |
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