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| 微分时间 | |||
| differential time: 19 phrases in 9 subjects |
| Air defense | 2 |
| Aviation | 1 |
| Business | 1 |
| Electric machinery | 1 |
| Electronics | 8 |
| Geophysics | 1 |
| Hydroelectric power stations | 1 |
| Space | 1 |
| Technology | 3 |
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