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| commutation number | |||
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| 换 相数: 16 phrases in 10 subjects |
| Business | 2 |
| Chemistry | 1 |
| Earth sciences | 1 |
| Economy | 2 |
| Electronics | 2 |
| Mathematics | 2 |
| Oil / petroleum | 1 |
| Project management | 1 |
| Space | 1 |
| Technology | 3 |
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