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一、鉴别物质例l (2003年新疆维吾尔自治区)一学校在课外调查中发现,原来生产生活中许多金属器具,被合成塑料替代,同学们想用学过的物理知识采用多种方法来鉴别金属和塑料.请你
I. Identification Substance Example 1 (Xinjiang Uygur Autonomous Region, 2003) A school discovered during an extra-curricular investigation that many of the original metal tools used in production and life were replaced by synthetic plastics. Students would like to use the physical knowledge they have learned to identify metals using various methods. And plastic. Please