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| plane section | |||
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平 截 面 : 37 phrases in 12 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Bridge construction | 7 |
| Construction | 1 |
| Earth sciences | 1 |
| Economy | 1 |
| Electronics | 7 |
| General | 1 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 1 |
| Technology | 13 |
| Textile industry | 2 |
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