15. 党政机关、社会团体、企事业单位和个人,为了实现某项目标和完成某项任务而事先拟订目标、措施和要求的事务文书。是( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
免费的网站请分享给朋友吧