问题：
[单选题]兴奋通过神经-骨骼肌接头时,乙酰胆碱与N-型Ach门控通道结合,使终板膜( )
A、对 Na+ 、K+ 通透性增加,发生超极化
B、对 Na+ 、K+ 通透性增加,发生去极化
C、仅对K+ 通透性增加,发生超极化
D、仅 对Ca2+ 通透性增加,发生去极化
E、对ACh通透性增加,发生去极化
参考答案：
B
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