题目

下列哪一种试剂可以鉴别乙醇、乙醛、乙酸、甲酸四种无色溶液A．银氨溶液    B．浓溴水   C．FeCl3溶液    D．新制Cu(OH)2浊液  答案：D解析: She is so helpful that she is always ready to help people in trouble. Which of the following is correctfor the underlined word in the sentence? A．/'tr37bl/B．/'tra7bl/C．/'trKbl/D．/'tr?bl/