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| strobing gate | |||
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选 通 门 : 19 phrases in 10 subjects |
| Air defense | 3 |
| Architecture | 1 |
| China | 1 |
| Construction | 1 |
| General | 2 |
| Metallurgy | 2 |
| Oil / petroleum | 1 |
| Project management | 1 |
| Space | 3 |
| Technology | 4 |
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