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【单选题】
关于窦房结细胞动作电位的描述，哪一项是错误的A.
最大复极化电位为-70 mV
B.
阈电位为-40 mV
C.
无明显的复极化1期和平台期
D.
除极化幅度小于浦肯野细胞
E.
0期除极化时程比浦肯野细胞短得多
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