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【多选题】
苯二氮䓬类药物的作用机制是A.
增强了中枢γ-氨基丁酸（GABA）神经元的作用
B.
阻断中枢的苯二氮䓬（BDZ）受体
C.
激活中枢的苯二氮䓬（BDZ）受体
D.
抑制了中枢γ-氨基丁酸（GABA）神经元的作用
E.
使Cl—通道开放频率增加
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反馈参考答案：
举一反三
【简答题】数据之间的差异程度或频数分布的分散程度称为（ ）。
【单选题】One of the main problems was making sure that the grass had enough water each day to stay______________.
A.
health
B.
healthy
【单选题】I would like to use this opportunity to ___ my commitment to making sure that the work of the World Health Organization will have a positive and lasting impact on the health of women.
A.
underlie
B.
underline
C.
understate
D.
undertake
【单选题】Intermediaries create ________ by making sure that the consumers get what they need where they want it.
A.
time utility
B.
place utility
C.
form utility
D.
service utility
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