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| prior operation | |||
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预运行 : 22 phrases in 10 subjects |
| Automobiles | 1 |
| Aviation | 1 |
| Earth sciences | 7 |
| Electronics | 4 |
| General | 1 |
| Hydroelectric power stations | 1 |
| Nuclear and fusion power | 1 |
| Nuclear physics | 1 |
| Project management | 1 |
| Technology | 4 |
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