迷走神经释放乙酰胆碱与心肌细胞膜上何种受体结合()。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
如图所示,神经肌肉接头前膜受体的离子通道与乙酰胆碱受体的离子通道均为()
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