动作电位下降部分是膜的().
A.极化过程
B.去极化过程
C.复极化过程
D.反极化过程
参考答案:C
I don’t know the girl in red. Could you tell me ________?
A.what is her name
B.how old is she
C.who is she
D.where she comes from
阻断神经节N受体,可引起()
A.血压下降
B.唾液分泌增加
C.呼吸麻痹
D.胃肠平滑肌痉挛
E.骨骼肌松弛