题目内容

下列那些符合正常QRS波群的波形特点

A. V1~V2导联主波向下，V4~V6导联主波向上
B. V1～V6导联R波逐渐减低，S波逐渐升高
C. aVR导联主波向下; aVL、aVF导联主波可以向上，也可以向下
D. I、Ⅱ、Ⅲ导联在没有电轴偏移的情况下，主波方向一般向上
E. V3导联一般正、负波相等

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