用斐林试剂鉴定还原糖，结果应该呈现的颜色是

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='21868' and id < 1911174 and id<>'1911174' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='21868' and id > 1911174 and id<>'1911174' order by id asc limit 5