How did it _____ that you failed to _____ in time yesterday?[ ]

A. come up; turn down

B. come on; turn over

C. come over; turn off

D. come about; turn up

对快速射血期心血管功能变化的叙述，下列哪一项有错误（）

A.心室压超过动脉舒张末压

B.半月瓣开放

C.血液快速从心室排入大血管

D.快速射血期血量占心室30%左右

E.心室压力迅速明显下降