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【简答题】
利用能量较低的红外辐射使化合物分子内部产生振动和转动运动，可引起对特定频率红外辐射的选择性吸收，从而形成特征性很强的红外吸收光谱而进行测定的实验基本原理所对应的是（）实验方法。
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举一反三
【简答题】C. Now listen to some tips for foreigners on how to do online-shopping in China. Listen carefully and supply the missing information to complete the summary China has a number of its own mature ______...
【单选题】A Foreign Trade Talk A company in America wants to import some toys and dolls from China. Mr. Baker, the representative of the American side, was sent to Shanghai to hold a business talk. Mr. Li from ...
A.
Because he has to ask his boss for instructions.
B.
Because he needs to wait for his boss’s arrival.
C.
Because he needs to get permission from his wife.
D.
Because he has to send telegrams to his customers.
【简答题】下列氧化剂：1.KClO3、2.Br2、3.FeCl3、4.KMnO4、5.H2O2，当其溶液中H+浓度增大时, 氧化能力增强的是。（直接写序号，中间不空格也不加标点符号）
【简答题】下列氧化剂：1.KClO3、2.Br2、3.FeCl3、4.KMnO4、5.H2O2，当其溶液中H+浓度增大时, 氧化能力增强的是。（答案只写序号，中间不空格也不加标点符号）
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