Thursday, September 22, 2022
Saturday, September 17, 2022
Thursday, September 22, 2022
问题:单选题现况调查样本大小取决于()A 被调查人群以往该病的患病率B 被调查人群现在该病的患病率C 被调查人群的稳定性D 你对该调查项目精确度的要求...
Tuesday, October 3, 2023
Monday, September 19, 2022
Thursday, September 22, 2022
Thursday, September 22, 2022
问题:单选题属于牙膏中芳香剂的是()A 薄荷B 丙三醇C 苯甲酸盐D 二氧化硅E 月桂醇硫酸钠...
Thursday, December 8, 2022
Thursday, September 22, 2022
Thursday, September 22, 2022
Sunday, September 18, 2022
Wednesday, September 14, 2022
Thursday, September 22, 2022
Thursday, September 22, 2022
Friday, September 16, 2022
Wednesday, September 21, 2022
问题:欲对某社区的小学生开展牙周疾病的预防项目,拟根据学生不同情况采取不同的预防措施。除健康教育外如对这些小学生实施牙周疾病预...
Thursday, September 15, 2022
Thursday, September 22, 2022
问题:现况调查样本含量估计常用以下公式:N=K×Q/P,其中K值是根据研究项目的允许误差大小而确定,当允许误差为20%(0.1...
Tuesday, August 9, 2022