一度房室传导阻滞特征性的心电图是（） A.P-R间期固定不变，>0.20s，有QRS
题型：单项选择题 B型题
问题：
一度房室传导阻滞特征性的心电图是（）
A.P-R间期固定不变，>0.20s，有QRS波群脱落
B.P-R间期逐渐延长，可>0.20s，无QRS波群脱落
C.P波与QRS波群之间没有关系
D.P-R间期>0.20s，无QRS波群脱落
E.P-R间期逐渐延长直至QRS波群脱落
题型：单项选择题 B型题
用方框中词的适当形式填空
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