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【单选题】
根据下面四个有机化合物分子的 PKa 数值,判断哪个酸性最弱?A.
分子
B.
分子
C.
分子
D.
分子
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皮皮学刷刷变学霸
举一反三
【简答题】在关系代数中专门的关系运算包括()、()、()、除等运算。
【简答题】在关系代数中专门的关系运算包括 、投影、 、除等运算
【简答题】在关系代数中专门的关系运算包括选择，投影、【 】、除等运算。
【单选题】______ is unfit for the office. A. It seems to me that B. It seems to me that he C. That seems he D. That seems to him that
A.
It seems to me that
B.
It seems to me that he
C.
That seems he
D.
That seems to him that
【简答题】专门的关系运算包括()、()、()、除等运算。
【简答题】Now, talk about what sickens you and what bugs you in your life.(造两个句子) ---- It sickens me to see / It sickens me that .. ----It bugs me to see/It bugs me that..
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