[单选题]有关IB类抗心律失常药物的电生理效应，叙述不正确的是

A、有效不应期/动作电位时限比值增大
B、不延长动作电位时限
C、缩短有效不应期
D、延长有效不应期
E、延长动作电位时限

参考答案： C

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