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【单选题】
凝胶层析分离的依据是( )。A.
固定相对各物质的吸附力不同
B.
各物质在流动相和固定相中的分配系数不同
C.
各物质与专一分子的亲和力不
D.
各物质分子大小不同
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【简答题】Match the following academic words with their definitions or synonyms. ____ 1 shroud a easy to obtain or use ____ 2 accessible b suppose ____ 3 explicitly c...
【简答题】( D ) Americans think a great deal about time. From childhood they learn to value (珍惜) time. As children, they are taught to be on time to go to school, to do work and to do everything. When they are ...
【简答题】Match the following words with their denefitions or synonyms. 1 exemplify a carefulness 2 localize b use up (resources or materials) 3 cautiousness c having reason or understanding 4 prerequisite d a ...
【简答题】Match the following acedemic words with their definits or synomyms. 1 exemplify a carefulness 2 localize b use up (resources or materials) 3 cautiousness c having reason or understanding 4 prerequisit...
【单选题】abet
A.
to encourage sb to do sth bad
B.
to start to happen or exist
C.
to praise sb publicly
【简答题】Why does the first interviewee think it necessary for Americans to understand different cultures to work effectively?
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