风湿性二尖瓣狭窄最常见的心律失常是（）
A.室性期前收缩
B.阵发性心动过速
C.房室传导阻滞
D.心房颤动
E.心房扑动
参考答案：D
---Eating fruit and vegetables ________our health.
----I agree. We should eat them more.
A．is good to
B．is good at
C．is good for
D．is good with
直流杂散电流腐蚀的防护措施有哪些？
