某班级20名学生某学年获得的奖学金情况分别是:一等1000元2名,二 等500元4名,三等300元8名和其他没得到,那么这组数据的异众比率是( )
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