Many great men were born in poor families________ Edison.
实验
组号
处理
微电极刺激突触前神经元测得动作电位（mV）
室温，0.5ms后测得突触后神经元动作电位（mV）
Ⅰ
未加河豚毒素（对照）
75
Ⅱ
浸润在河豚毒素中
5min后
65
Ⅲ
10min后
50
25
Ⅳ
15min后
40
0
