队列研究中,如果随访时间较长,观察人数变动较大时,多采用下列哪种指标表示发病水平() 发布时间:2017-09-14 22:48 │ 来源:www.tikuol.com 题型:单项选择题 A1/A2型题 问题: 队列研究中,如果随访时间较长,观察人数变动较大时,多采用下列哪种指标表示发病水平()。A.年发病率B.发病密度C.累计发病率D.罹患率E.以上均不对
题型:单项选择题 A1/A2型题 _________ parents’ complaints, some cities have significantly cut school hours to give children more time for leisure and play.A.In exchange forB.In response to C.In harmony withD.In terms of 查看答案