提出用极限比速法，并采用厂家公式校核的方法选取冲击式机组。
An ultimate specific speed method checked by formula of manufacturer is proposed.
高水头电站一般采用冲击式水轮发电机组，引水系统长，容易产生水压波动。
The impulse turbine unit is normally used in high water-head power stations, whose diversion system is long and is likely to cause pressure fluctuation.
高水头电站一般采用冲击式水轮发电机组，引水系统长，容易产生水压波动。
The impulse turbine unit is normally used in high water-head power stations, whose diversion system is long and is likely to cause pressure fluctuation.
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