... 频率空间 frequency space 频率展延 frequency spread 频率稳定性 frequency stability ...
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尽管中国有悠久历史,但利用历史洪水展延洪水频率曲线以求稀遇设计洪水,仍感困难和不可靠。
Although there is a long history in China, it is very difficult and unreliable to extrapolate frequency curve to long recurrence design floods.
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