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二次控制 : 34 phrases in 9 subjects |
| Automated equipment | 1 |
| Automobiles | 7 |
| Aviation | 1 |
| Earth sciences | 6 |
| Electronics | 3 |
| General | 1 |
| Metallurgy | 9 |
| Space | 4 |
| Technology | 2 |
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