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【简答题】
将下列化合物按照亲核加成反应活性从大到小的顺序排列:( )>( ) >( ) >( )。 1苯乙酮 2甲醛 3苯甲醛 4 乙醛
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皮皮学刷刷变学霸
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【单选题】根据以下内容回答题： Many things about language are a mystery，and many will always remain so.But sone things we do know． First，we know that all human beings have a language of some sort．Thero is no race of men ...
A.
some backward race doesn’t have a language of its own
B.
some race in history didn’t possess a language of its own
C.
any human race，whether backward or not，has a language
D.
some races on earth can communicate without language
【单选题】English is considered as a(n) _____ language, and it is no surprise that there are so many people in the world learning it. [ ]
A.
universal
B.
logical
C.
artificial
D.
regular
【简答题】举出至少4种不同的肽段氨基酸序列的测定方法。
【简答题】按_____划分，导游员分为海外领队、全程陪同导游员、地方陪同导游员和景点景区导游员。
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