在病例对照研究中,估计某因素与疾病的联系程度,应计算
A.RR
B.RR-1
C.OR
D.OR-1
E.P1-P0
参考答案:C
.Opening the book, she found in it a white, plain envelope with her name ______ on it.
A.to print
B.printed
C.printing
D.print
发现新生儿鼻腔内有表面光滑的肿物,首选:()
A.穿刺
B.取病理
C.局部用血管收缩剂
D.CT扫描
E.上述都不是