已知职工表的“性别”字段为“是/否”型,设置“性别”为查阅字段,用1(是)表示男,用0(否)表示女,则该查阅字段的“行来源”属性应该是( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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