甲、乙两人在机械厂的同一车间工作。某日上班时,甲因疏忽大意,操作不当,致乙右臂伤残。有关该事件的下列表述哪个是正确的?
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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