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【单选题】
离子交换树脂法分离麻黄碱与伪麻黄碱是利用A.
极性的差异
B.
水溶性的差异
C.
碱性的差异
D.
挥发性的差异
E.
升华性的差异
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举一反三
【单选题】The diagnosis of multiple sclerosis is often based upon which finding?
A.
The presence of elevated protein and low glucose
B.
A decreased IgG index
C.
The presence of oligoclonal bands by electrophoresis
D.
An increased level of CSF β-microglobulin
【单选题】The new finding is based on a thorough study of 170，000 stars on the Milky Way. 查看材料
A.
Right
B.
Wrong
C.
Not mentioned
【单选题】Snedeker, Geren and Shafto based their study on children who
A.
were finding it difficult to learn English
B.
were learning English at a later age than US children
C.
had come from a number of language backgrounds
D.
had taken English lessons in China
【简答题】Questions 3 and 4 are based on the news report you have just heard.A.Finding cheaper ways of highway construction. B.Generating electric power for passing vehicles. C.Providing clean energy to five mi...
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