第4题: [单项选择]S1分裂可见于 A. 主动脉瓣狭窄 B. 室间隔缺损 C. 完全性右束支传导阻滞 D. 完全性左束支传导阻滞 参考答案:C 答案解析:第一心音(S1)由二尖瓣和三尖瓣关闭引起。正常情况下,三尖瓣较二尖瓣延迟关闭0.02~0.03s,该时间差不能为人耳分辨。当S1的两个成分相距0.03s以上
第24题: [单项选择]______ I'd have told you. A. If I would have known it B. If I had have known it C. Had I known it D. Should I known it 参考答案:C 答案解析:本题考查虚拟语气用法。从主句推出此句是表达与过去事实相反的情况,从句中应用 had done形式。如果if去掉,句子需用倒装。句意为:如果我知道的话,我就告诉你了。
第33题:[单选题]#include <stdio.h>
void main()
{
char str[]="\"stop!\",he said";
printf(str);
}
程序的运行结果是 ( )。 A.stop! B. "stop!"
C. "stop",he said D. he said*/ 参考答案:B