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【多选题】
下列黄酮类化合物能溶于5%碳酸钠的有( )。A.
7，4′－二羟基黄酮
B.
5－羟基黄酮
C.
7－羟基黄酮
D.
4′－羟基黄酮
E.
一般酚羟基黄酮
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反馈参考答案：
举一反三
【简答题】维持蛋白质胶体系统稳定性的主要因素?
【单选题】It may be inferred from the passage that at the time Invisible Man was published, many blacks contributed more to American life than Ellison by
A.
establishing and arguing for the implementation of social practices more affirmative than those found in Invisible Man
B.
eschewing the obligations that praise of Ellison's work entailed for him, and thereby working to subvert the literary system
C.
supporting a vision of 'exceptional' America in contrast to Ellison's 'unexceptional' version, and broadening the scope of that vision
D.
putting the same theories of reform. Ellison espoused in his book into concrete practice through activism
E.
exposing the more effective critique of traditional American values advanced by Ellison's literary precursors
【简答题】下列不属于调整图像命令的是
【简答题】离体神经纤维某一部位受到适当刺激时，受刺激部位细胞膜两侧会出现暂时性的电位变化，产生神经冲动。图示该部位受刺激前后，膜两侧电位差的变化。请回答： 图中a线段表示（）（静息、动作）电位；b点膜两侧的电位差为（）mV，此时Na + （）（内、外）流。
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