Thursday, September 22, 2022
Thursday, September 22, 2022
Saturday, September 17, 2022
Thursday, September 22, 2022
问题:某乡有人口2万人约5000户,欲以户为单位抽其中2000人进行某病的调查。该研究的抽样比是()...
Thursday, September 15, 2022
Thursday, September 22, 2022
问题:在德国柏林大学开设社会卫生学讲座,首次提出健康、疾病与社会的相互关系的人是( )。...
Thursday, September 22, 2022
Thursday, September 15, 2022
Thursday, September 22, 2022
Sunday, September 18, 2022
Sunday, September 18, 2022
Thursday, September 22, 2022
Thursday, September 22, 2022
Thursday, September 22, 2022
问题:1988年1月上海曾暴发一起因生吃鱼、贝类食物引起的甲肝大流行,后经各级部门采取综合防治措施得以控制。下列哪项是针对传播...
Thursday, September 22, 2022
Friday, September 16, 2022