正常成人心率超过180次/分时，心输出量减少是因为（） A.等容舒_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

正常成人心率超过180次/分时，心输出量减少是因为（）

A.等容舒张期缩短

B.减慢充盈期缩短

C.等容收缩期缩短

D.舒张后期缩短

E.快速充盈期缩短

答案

参考答案：E

选择题

Have you _____ your father recently?

No. He doesn't often write to me. [ ]

A. heard about

B. heard of

C. heard from

D. got from

单项选择题

()

A．A

B．B

C．C

D．D