下列哪种情况不宜选用洋地黄:()
A.二度房室传导阻滞
B.室上性阵发性心动过速
C.肥厚梗阻型心肌病
D.快速型房颤
E.单纯二尖瓣狭窄
参考答案:A, C, E
You are working too hard.You’d better keep a________between work and relaxation.
(2012·天津,3)
A.promise
B.lead
C.balance
D.diary
单相全控桥和三相半波可控整流电路带大电感负载时如果不接续流二极管,电路可以正常工作,其移相范围为()~90°。