发布时间:2025-02-04 05:35:35
分别取少量加入斐林试剂甲醛和乙醛会产生砖红色沉淀,甲醇和乙醇不反应。甲醛和乙醛分别用碘仿反应检验,乙醛会产生黄色沉淀,甲醛无此现象;同样用碘仿反应鉴别甲醇和乙醇,乙醇会生成黄色沉淀,甲醇无此现象。
阳台中间窗户下面是墙体拆掉装完玻璃后用力摇窗户感觉有些晃动不稳固怎么办
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