单因素敏感性分析中,设甲、乙、丙、丁四个因素均发生10%的变化,使评价指标相应地分别产生10%、15%、25%、30%的变化,则敏感因素是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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