搜题请搜索小程序“爱下问搜题”
问题 单项选择题

心肌有效不应期较长的主要作用为

A．使心肌得到充分的休息
B．使心肌产生“全或无”式收缩
C．避免心肌发生强直收缩
D．便于窦房结控制心节律
E．使心房和心室交替收缩

答案

参考答案：C

单项选择题

In his speech at the conference, the Chairman solemnly stated that the responsibility to our lives and the kind of world in that we live is ours and ours alone.

A．for ... in which

B．of... for which

C．of... in which

D．for ... on which
查看答案
单项选择题

咳嗽频剧，咯痰不爽，痰黏稠，常伴有鼻流黄涕，口渴，头痛，恶风，身热，舌苔薄黄，脉浮数。其治法是

A．疏风清肺，润燥止咳
B．宣肺清热，平肝化痰
C．清热化痰，滋阴润肺
D．肃肺化瘀，化瘀通络
查看答案