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举一反三
【单选题】化合物 C 3 H 5 Cl 3 , 1HNMR 谱图上有 3 组峰的结构式是 ( )
A.
CH 3 -CH 2 -CCl 3
B.
CH 2 Cl-CH 2 -CHCl 2
C.
CH 2 Cl-CH 2 -CH 2 Cl
D.
CH 3 -CCl 2 -CH 2 Cl
【单选题】Doctors are to begin a trial of a drug treatment that could double the time transplanted organs survive in the body. The 20-minute procedure effectively coats donor organs in a protective shield that ...
A.
It is developed by researchers in US.
B.
It can extend the life of implanted organs.
C.
It is independent of defense mechanism.
D.
It can improve patients’ health.
【单选题】抗抑郁药帕罗西汀的作用机制是
A.
抑制5-HT及去甲肾上腺素再摄取，增强中枢5-HT能及NE能神经功能
B.
选择性抑制5-HT的再摄取，增加突触间隙5-HT浓度，从而增强中枢5-HT能神经功能
C.
抑制突触前膜对去甲肾上腺素的再摄取，增强中枢去甲肾上腺素能神经的功能
D.
抑制A型单胺氧化酶，减少去甲肾上腺素、5-HT及多巴胺的降解
E.
抑制突触前膜对5-HT的再摄取，并拮抗5 -HT1受体，也能拮抗中枢α1受体