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【单选题】
苯巴比妥的鉴别反应包括A.
硫酸-亚硝酸钠反应、中和反应
B.
硫酸-亚硝酸钠反应、甲醛-硫酸反应
C.
甲醛-硫酸反应、中和反应
D.
芳香第一胺反应和水解反应
E.
重氮化-偶合反应和硫酸-亚硝酸钠反应
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皮皮学刷刷变学霸
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A.
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the sculptor is famous
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【单选题】The main idea of the passage is about ______.
A.
the present condition and the prospect of TV programs
B.
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C.
profits got by soaps through advertisements
D.
a brief introduction of soaps
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