题目内容

That man is ________ important person.

A. a
B. an
C. /
D. in

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It will be there ________ five minutes.

A. on
B. in
C. at
D. for

I want to buy _________ online.

A. a jeans
B. a pair of jeans
C. two jeans
D. two pair of jeans

何谓动作电位？有何特点？

何谓静息电位?试述其产生机制。.