应用快速的检查方法,从人群中查出某病的可疑患者,该研究方法属于()。
A.筛查
B.普查
C.队列研究
D.生态学研究
E.病例对照研究
参考答案:A
_______ in the 1800s and first mass-produced in Germany, the harmonica(口琴) was designed to play simple folk tunes.
A.Being invented
B.Inventing
C.Invented
D.Having invented
镜下血尿为每高倍视野的红细胞超过()。
A.0个
B.1个
C.3个
D.4个
E.10个