指派问题的标准形式是:有n个人和n件事,已知第i个人做第j件事的费用为Cij(i,j=1,2,...,n),要求确定人和事之间的一一对应的指派方案,使完成这n件事的总费用最小。( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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