下列说法中正确的是 A由多种成分组成的物质是混合物b由同种分子构成的物质是纯净物c由不同种元素组成的物质是化合物d由同种元素组成 Template




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tomski下列说法中正确的是 a由多种成分组成的物质是混合物b由同种分子构成的物质是纯净物c由不同种元素组成的物质是化合物d由同种元素组成 coloring