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| 中梁式车架中央脊梁管 | |||
| 总管; 中心管道; 中心管 | |||
| central tube: 19 phrases in 7 subjects |
| Agriculture | 1 |
| Automobiles | 5 |
| Bridge construction | 2 |
| Chemistry | 1 |
| Electronics | 1 |
| Space | 1 |
| Technology | 8 |
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