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| 中导板 (六管炮的) | |||
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center track : 24 phrases in 7 subjects |
| Automobiles | 1 |
| Bridge construction | 1 |
| Electronics | 1 |
| Hydroelectric power stations | 1 |
| Rail transport | 3 |
| Technology | 16 |
| Telecommunications | 1 |
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