急性心肌梗死发生室性期前收缩可减少室颤危险的药物()。
A.西地兰
B.利多卡因
C.莫雷西嗪
D.美托洛尔
E.美西律
参考答案:D
I'd like to have visited the Palace Museum last week, but something unexpected _____to my father.
A.had happened
B.happened
C.has happened
D.happens
地下燃气管道不得从其下面穿越的场所是()
A.隧道
B.鞭炮厂
C.排水管
D.住宅小区绿化带