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【单选题】
苯二氮䓬类药物的中枢抑制作用主要机制是( )A.
直接激动GABA受体,使Cl - 内流减少,细胞膜超极化
B.
与BZ结合位点结合,使Cl - 内流减少,细胞膜超极化
C.
作用于Cl - 通道,直接促进Cl - 内流
D.
与BZ结合位点结合,最终使Cl - 通道开放频率增加
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