可使冠脉血流量减少的因素有A．舒张压降低 B．冠状动脉管腔狭窄

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问题多项选择题

可使冠脉血流量减少的因素有

A．舒张压降低

B．冠状动脉管腔狭窄

C．心率加快

D．心动周期延长

E．心肌肥厚

答案

参考答案：A, B, C

解析：冠脉供血主要发生在心室的舒张期

选择题

We _____ in this pool when we were young, but now it _____ fish. [ ]

A. are used to swim; used to keep

B. are used to swimming; is used to keep

C. used to swim; used to keep

D. used to swim; is used for keeping

单项选择题

（）主要用于对工人整个工作日的时间利用情况进行观察记录和分析。

A.工作日写实法

B.技术测定法

C.瞬间观测法

D.测时法