二度Ⅱ型及三度房室传导阻滞,心室率慢时可采用()
A.异丙肾上腺素
B.食管起搏
C.临时或永久起搏器植入
D.阿托品
E.以上均不对
参考答案:A, C, D
---It’s raining! When did it start?
---I don’t know exactly. In fact, it ____ all this afternoon.
A.lasts
B.has lasted
C.lasted
D.will last
自行车和三轮车共39辆,总共有96只车轮,自行车和三轮车各有多少辆?