心脏听诊，听到大炮音应考虑( )。
A．二尖瓣狭窄
B．P-R间期缩短
C．运动或发热
D．完全性房室传导阻滞
E．甲状腺功能亢进
参考答案：D
But for the arrival of the police, you __________ killed yesterday.
A．might have been
B．could have been
C．may have
D．would be
下列变量名的定义中，符合Java命名约定的是( )。
A．fieldname
B．super
C．Intnum
D．$number
