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【单选题】
二盐酸奎宁,加二氧化锰,再加硫酸湿润,加热,产生的气体能使湿润的碘化钾淀粉试纸显蓝色,这是因为二盐酸奎宁中含有( )A.
氮原子
B.
喹啉杂环
C.
吡啶环
D.
盐酸盐
E.
旋光度
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