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校正角 : 28 phrases in 10 subjects |
| Air defense | 2 |
| Automobiles | 2 |
| Earth sciences | 1 |
| Electric machinery | 1 |
| Electronics | 1 |
| General | 1 |
| Military | 1 |
| Oil / petroleum | 4 |
| Shipbuilding | 1 |
| Technology | 14 |
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