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【单选题】
下列心电图各导联波形及电压描述正确的是A.
P波的方向在I、II、III、avr导联可以是直立的
B.
P波振幅＜0.25mv,时间＜0.12s
C.
Q波深度高于同导联R波的1/4
D.
RV1＞1.0mv
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