流行病学研究主要用于A.研究疾病的病因 B.评价人群的健康状况 C.研究疾病预防和控 发布时间:2017-12-06 09:45 │ 来源:www.tikuol.com 题型:单项选择题 问题: 流行病学研究主要用于A.研究疾病的病因B.评价人群的健康状况C.研究疾病预防和控制D.考核疾病的防制效果E.以上均是
题型:单项选择题 AIDS is said __________ the biggest health challenge to both men and women in that area over the past few years. A.that it isB.to beC.that it has beenD.to have been 查看答案