题目内容

以下关于胆碱能受体的说法正确的是?

A. M受体主要分布在所有自主神经节后神经元上
B. N2受体分布于神经-肌肉接头的终板膜上
C. M受体可被筒箭毒碱拮抗
D. N受体可被阿托品拮抗

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中枢神经系统儿茶酚胺类递质失活的最主要方式:

A. 稀释到引起突触后反应的阈下值浓度
B. 重摄取
C. 单胺氧化酶(MAO)降解
D. 儿茶酚胺-氧化-甲基转移酶降解

For years, doctors_______millions of patients 'lives.

A. have saved
B. are saving
C. will save
D. were saving

Allen is looking forward to ______the trade fair.

A. meet
B. meeting
C. be meeting
D. having met

Important people don’t have much free time as their work_________ their time.

A. takes away
B. takes over
C. takes up
D. takes in

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