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【单选题】
凝胶色谱法的分离原理是( )。A.
吸附作用
B.
分子大小
C.
氢键缔合
D.
化学反应
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【单选题】听力原文： This library is an English language teaching and learning library. Unfortunately, our resources am limited and so not everyone can join. Teachers of English, university students and professional...
A.
Because it takes too long to process all the applications.
B.
Because its resources are limited.
C.
Because it is a library for special proposes.
D.
Because there is a shortage of staff.
【简答题】Welcome Message from the Librarian of Congress Dr. James H. Billington The Library of Congress is the nation's oldest federal cultural institution and serves as the research arm of Congress. It is als...
【单选题】Andy lives near the library. You can go to the library with _______ and _______ sister.
A.
his; his
B.
him; his
C.
him; he
D.
he; his
【单选题】Which library is the second phase of the National Library of China?
A.
The Shanghai Municipal Library.
B.
National Digital Library of China.
C.
Tha Shanghai Library.
D.
The Peking University Library
【单选题】Which is the largest public library in the United States?
A.
The Library of Congress.
B.
The Harvard University Library.
C.
The Chicago Public Library.
D.
The New York Public Library.
【简答题】瞬时值一般用大写字母E、U、I来表示。
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