甲、乙两流域除流域植被率甲大于乙外,其它流域下垫面因素和气象因素均相同,对相同降雨所形成的流量过程,甲流域的洪峰流量比乙流域的( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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