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本文讨论了初中化学中物质与混合物之间两组相互矛盾的命题 ,找出了造成逻辑错误的原因 ,澄清了由于物质这一概念的外延不定使某些概念含混不清的现象
This article discusses two sets of contradictory propositions between substances and mixtures in junior high school chemistry, identifies the causes of logic errors, and clarifies the phenomenon that certain concepts are ambiguous due to the extension of the concept of substances.