皮皮学，免费搜题
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【多选题】
分离生物碱可选择A.
氧化铝或硅胶吸附柱色谱
B.
分配柱色谱
C.
薄层色谱
D.
凝胶过滤色谱
E.
高效液相色谱法
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皮皮学刷刷变学霸
举一反三
【简答题】Why does the author give us an account of the 'exciting' features of 'electronic books'?
【单选题】It is implied in Paragraph 3 that graduates should______.
A.
aim to give a balanced account of what the employer needs
B.
consider careers which suit their values, interests and abilities
C.
recognize their own abilities regardless of what the employer looks for
D.
stress their personal attitudes and values in job applications
【简答题】Taking interests into account, it is illogical that free-traders give bribes to protectionist via ______.
【单选题】The purpose of the writer in writing the passage is ______.
A.
to give an objective account of the e-nose
B.
to question the wide use of the e-nose
C.
to discuss the advantages of the e-nose over the human nose
D.
to encourage the introduction of the e-nose to the market at a lower price
【简答题】向量 在向量 上的投影为
【简答题】Site users are required to give very detailed account of their physical characteristics in order to find them
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