题目

在鉴定还原糖的实验中，加入斐林试剂时，必须要( ) A．先加入斐林试剂甲液，后加入乙液 B．将斐林试剂的甲液和乙液等量混合均匀后再加 C．先加入斐林试剂乙液，后加入甲液 D．以上A、B、C三项操作方法都正确   答案：B斐林试剂主要是由质量浓度为0.1 g/mL的NaOH溶液和0.05 g/mL的CuSO4溶液等量混合后配制而成的，还原糖与斐林试剂反应出现砖红色沉淀24、    联合国教科文组织(UNESCO) 想了解你校的情况,发来了一个英文表格(见下表).请参考表格里的内容提示,用英语写一篇短文,介绍你校的相关情况.要求: 内容包括表格里的全部内容,字数不少于80字,不准出现真实的姓名和校名. Area of the school How many square meters? Building How many? Low or tall? Teacher and student How many? Teaching building How many? New or old? Sports field How many? Often in use? Teachers’apartment How many? New or old? Students’ apartment How many? New or old? Tree and flower How many? How do you like it? 生词: square meters: 平方米; teachers’ apartment: 老师公寓 ___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________