心功能好的阵发性室上性心动过速宜用（）
A.利多卡因
B.西地兰
C.异搏定
D.苯妥英钠
E.临时心脏起搏器
参考答案：C
It was very kind of you to do the washing up, but you _______ it.
A．mustn't have done
B．wouldn't have done
C．mightn't have done
D．didn't have to do
设有如下程序： public class Sun { public static void main(String args[ ]) { int x,y; x=4; y=0; if(Math.pow(x,2)==16) y=x; if(Math.pow(x,2)<15) y=1/x; if(Math.pow(x,2)＞15) y=(int)Math.pow(x,2)+1; System.out.println(y); } } 程序的运行结果是( )。
A．4
B．17
C．18
D．0.25
