... frequency relay 谐振继电器，频率继电器 frequency reproduction 频率重现 frequency resolution constant 频率分辨常数 ...
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指定设计重现期或频率的水文设计值为随机变数，有一定的分布规律，表明它有相应的不确定性。
The hydrologic design values of specific design return period or frequency are random variables having certain distribution pattern, so there are some uncertainty in it.
洪水频率(或重现期)是指一定时期内某种洪水出现的机率。
Flood frequency (return period) is referring to recurrence probability of flood in certain period.
把古洪水加入到洪水系列后进行频率计算，可以看出频率曲线基本合理，说明对1482年洪水重现期的判断是合理的。
It can be seen that the frequency curve calculation is basically reasonable and show the estimation of "1482 flood" return period is rational after putting palaeofloods into flood series.
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