挥发份优级，一级与合格品指标分别是（），（），（）.
参考答案：0.75；1.0；1.3
Few people seem to care about what a super star _____ before he/she became famous.
A．goes through
B．is going through
C．have gone through
D．had gone through
最严重的心律失常是（）。
A.心房扑动
B.心房颤动
C.室性心动过速
D.心室颤动
E.房室传导阻滞
