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控制 指示器 : 74 phrases in 14 subjects |
| Automobiles | 1 |
| Aviation | 21 |
| Chemistry | 1 |
| Earth sciences | 2 |
| Electronics | 13 |
| General | 8 |
| Geophysics | 1 |
| Information technology | 1 |
| Metallurgy | 4 |
| Mining | 4 |
| Oil / petroleum | 3 |
| Oil processing plants | 5 |
| Space | 5 |
| Technology | 5 |
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