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【单选题】
某弱酸性药物在PH=7的溶液中有90%解离,其pKa值约为A.
5
B.
6
C.
7
D.
8
E.
9
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反馈参考答案：
举一反三
【简答题】如图，在正方体ABCD—A 1 B 1 C 1 D 1 中，直线A 1 B 与平面A 1 B 1 CD 所成的角的大小等于 .
【简答题】化工原理中的流体质点是指()
【简答题】When my son, Mark, was in the third grade, he saved all his pocket money for over three months to buy holiday presents. The third Saturday in December Mark said he had made his list and had twenty dol...
【单选题】Vocabulary and Grammar ( 7 minutes ) Directions: There are a number of incomplete sentences in this part. For each sentence there are four choices marked A), B), C) and D). Choose the ONE that best co...
A.
unfriendly
B.
invasive
C.
aggressive
D.
bold
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