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对沒有观測过的河流发布水文預报时,要遇到許多困难,其中預报带来的誤差的变幅多大,所預报現象(数值)的“自然保証率”如何?如果不对这两个問題作
There are many difficulties encountered in hydrological forecasting of unmanaged rivers. What is the “natural rate of guarantee” of the predicted phenomena (numerical value)? What is the amplitude of the error caused by the forecast? If not, Question made