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【单选题】
室性期前收缩之后出现代偿性间歇的原因是A.
结的节律性兴奋延迟发放
B.
结的节律件兴奋少发放一次
C.
结的节律性兴奋传出速度大大减慢
D.
室性期前收缩的有效不特别长
E.
结一次节律兴奋落在室性期前收缩的有效不应期内
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B.
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