神经纤维膜电位由+30mV变为-70mV的过程称为
A．超极化
B．去极化
C．复极化
D．反极化
参考答案：C
----The teacher didn’t realize you had cheated in the exam.
----Well, _____!
A．what a relief
B．with great pleasure
C．no chance
D．that’s fine with me
2、1、0可组成的三位数有[ ]
A．2个
B．4个
C．6个
