二十四节气歌是怎么说的?
春雨惊春清谷天,夏满芒夏暑相连,秋处露秋寒霜降,冬雪雪冬小大寒,每月两节日期定,最多不差一二天。上半年六、二一、下半年八、二十三。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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