搜题请搜索小程序“爱下问搜题”
问题 单项选择题

室上性心动过速常见发病机制是

A．心房自律性增高

B．折返机制

C．触发激动

D．窦房结病变

E．心室自律性增高

答案

参考答案：B

解析：室上性心动过速常见发病机制是折返机制。

单项选择题

左前斜位上，心后间隙消失见于（）

A.左心房增大

B.左心室增大

C.右心房增大

D.右心室增大

E.二尖瓣狭窄
查看答案
填空题

根据首字母或汉语提示写出单词

1. Be careful, don't t________ on the step.

2. The nurse cleaned the w_________  before the operation.

3. Andy has a _________ (发烧) and won't be coming into the work today.

4. I was upset at ___________ (错过) all the excitement.

5. Tommy is still in bed with _________ (流感).
查看答案