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介绍一种有实用价值的胶片洗字液黄家培（北京护校１０１１００）投影仪已广泛在化学课堂教学和科技讲座中得到应用．其所用透明塑料胶片两面的功能不同；一面涂有药液．常称磨面（或胶面），彩笔在上书写后不易掉色，用水或纯有机溶剂都不能洗脱字迹，可长期保存。另一面...
2. Introducing a film washing liquid with practical value Huang Jiapei (Beijing Nursing School 101100) projector has been widely used in chemistry class teaching and technology lectures. The transparent plastic film used has different functions on both sides; it is coated with a liquid on one side. It is often called grinding surface (or plastic surface). It is not easy to discolor the colored pencil after it is written. Water or pure organic solvent can not be used for writing and can be stored for a long time. the other side...