问题
单项选择题
下列哪种方法不能控制流行病学研究的偏性
A.增加样本含量
B.遵守随机化原则
C.校准仪器设备
D.增加应答率
E.采用盲法设计
答案
参考答案:A
下列哪种方法不能控制流行病学研究的偏性
A.增加样本含量
B.遵守随机化原则
C.校准仪器设备
D.增加应答率
E.采用盲法设计
参考答案:A
A. in Shanghai People’s Square B. in the club C. in Hunan History Museum 小题2: We can’t learn __________ in the club. A. Music B. Art C. English 小题3: If you want to have music and dance lessons, you will pay _________. A.¥90 B. ¥150 C. ¥180 小题4: People can visit the museum at _________ every day. A.1:00 pm B.3:00 pm C.7:00 pm 小题5:_______ can get into the museum for free. A. An adult B.A student C.A child under 6 years old |