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varying head | |||
variable head; varying water head | |||
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variable head | |||
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falling head |
变水头: 23 phrases in 8 subjects |
Drilling | 1 |
Earth sciences | 2 |
Electronics | 1 |
Engineering geology | 3 |
Hydroelectric power stations | 6 |
Oil / petroleum | 2 |
Soil science | 1 |
Technology | 7 |