定群研究又称为
A.队列研究B.实验研究C.现况调查D.病例对照调查E.临床随访研究
参考答案:A
After seeing the movie, _____. [ ]
A. the book was read by him.
B. the book made him want to read it.
C. he wanted to read the book.
D. the reading of the book interested him.
心率对病人的心排血量影响很大,在一定范围内,随着心率的增加,心排血量增加,下列正确的说法是()
A.心率在50~160/min时,心排血量随心率增加而增加
B.心率在60~160/min时,心排血量随心率增加而增加
C.心率在60~120/min时,心排血量随心率增加而增加
D.心率在60~120/min时,心排血量随心率增加而增加
E.心率在50~120/min时,心排血量随心率增加而增加