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【单选题】
膜电位突然由电位改变为0 mV时A.
NA+通道开放，产生净NA+内向电流
B.
NA+通道开放，产生净NA+外向电流
C.
NA+通道开放，不产生净NA+电流
D.
K+通道开放，不产生净K+电流
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