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自动 指示器 : 49 phrases in 11 subjects |
| Air defense | 1 |
| Automobiles | 3 |
| Aviation | 6 |
| Earth sciences | 1 |
| Electronics | 8 |
| Engineering geology | 1 |
| General | 1 |
| Geophysics | 1 |
| Shipbuilding | 2 |
| Space | 7 |
| Technology | 18 |
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