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闭 点 : 108 phrases in 10 subjects |
| Aviation | 1 |
| Chemistry | 2 |
| Electrical engineering | 7 |
| Electronics | 30 |
| General | 22 |
| Microelectronics | 1 |
| Oil / petroleum | 3 |
| Production | 1 |
| Radio | 1 |
| Technology | 40 |
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