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【单选题】
在等流时线法中,当净雨历时tC大于流域汇流时间τ时,洪峰流量是由( )。A.
部分流域面积上的全部净雨所形成
B.
全部流域面积上的部分净雨所形成
C.
部分流域面积上的部分净雨所形成
D.
全部流域面积上的全部净雨所形成
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