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【单选题】
下列关于正常心电图的叙述，错误的是( )A.
P波反映两个心房的除极和复极过程
B.
QRS波反映两个心室的除极过程
C.
P-Q间期反映兴奋从心房传到心室的时间
D.
在S-T段期间，心室各部分间不存在电位差
E.
T波反映两个心室复极化过程中的电位变化
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A.
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B.
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C.
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D.
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