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| 导叶轴 | |||
| 闸门杆 | |||
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gate stem : 9 phrases in 6 subjects |
| Compressors | 1 |
| Ecology | 1 |
| Hydroelectric power stations | 3 |
| International trade | 1 |
| Oil / petroleum | 1 |
| Technology | 2 |
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