听诊检查心音时，若心音与脉搏同时出现，此时的心音为（）
A.第一心音
B.第二心音
C.第三心音
D.第四心音
E.缩期前杂音
参考答案：A
―My chance will come soon.
― .
A．Every dog has its day.
B．A good medicine tastes bitter
C．A good name is easier lost than won
D．Blind men can judge no colors
什么叫电气主接线？
