汇流阶段是指净雨沿地面和地下汇入河网,并经过河网汇集形成流域出口断面流量的过程。由净雨推求流域出口断面过程称为汇流计算。汇流两个阶段坡面汇流和河网汇流
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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