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| water-head difference | |||
| head difference; differential head | |||
| difference of water head; head differential | |||
| water head drop | |||
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水 头 差 : 17 phrases in 6 subjects |
| Bridge construction | 2 |
| Electric machinery | 1 |
| Engineering geology | 1 |
| Hydroelectric power stations | 3 |
| Securities | 1 |
| Technology | 9 |
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