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【单选题】
逻辑图和输入A的波形如下图所示,输出F的波形为A.
mg src="http://p.ananas.chaoxing.com/star3/origin/690f4a847366553674fb20f41a72e640.jpg">
B.
A波形
C.
B波形
D.
C波形
E.
D波形
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反馈参考答案：
举一反三
【单选题】关于药物与受体相互作用的说法哪个不正确
A.
结构特异性药物的活性与药物和受体的作用有关
B.
药物和受体的作用方式分为可逆作用和不可逆作用
C.
药物与受体以共价键结合时，形成可逆的复合物
D.
药物与受体可逆的结合方式主要是：离子键、氢键、范德华力、电荷转移复合物和疏水作用等
【单选题】听力原文： In this century the traditional American family is constantly faced with the threat of breakdown. Some sociologists suggest that one little-noticed cause may be the introduction of the TV dinner...
A.
The problem of poverty.
B.
The problem of having few children.
C.
The problem of poor living conditions.
D.
The problem of divorce.
【简答题】Keep your personal items off the restaurant table. It’s a poor practice to place all sorts of belongings on a restaurant table. These include items such as your cell phone, car keys or clutch bag, to ...
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