题目内容

样品溶液+NaBH4生成红至紫红色的是

A. 二氢黄酮类
B. 异黄酮类
C. 黄酮
D. 黄酮醇
E. 查耳酮

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两相溶剂萃取法分离混合物中各组分的依据是

A. 结构类型不同
B. 化学性质不同
C. 极性差异较小
D. 极性差异较大
E. 分配系数不同

设立个人独资企业可以用货币、实物、土地使用权、劳务、知识产权或者其他财产权利出资。 ( )

A. 对
B. 错

下列溶剂中能与水以任意比例混合的有机溶剂是

A. 正丁醇
B. 乙酸乙酯
C. 丙酮
D. 乙醚
E. 氯仿

A. WHAT ARE IMPORTANT FOR A COMFORTABLE WORKING ENVIRONEMNT LIGHTING INDIVIDUAL WORKPLACE WASHROOM FACILITIESB. WHAT SKILLS A MANAGER SHOULD HAVE ABUNDANT TECHNICAL SKILLS CONCEPTUAL SKILL HUMAN SKILLSC. WHAT ARE THE CHARACTERISTICS OF THE FOREIGN EXCHANGE MARKET IT HAS BEEN GROWING AT RAPID PACE. IT NEVER SLEEPS. MOST TRANSACTIONS IN THE MARKET INVOLVED DOLLARS. IT IS AN INTEGRATION OF THE VARIOUS TRADING CENTERS.