下列说法正确的是 A.只含一种元素的物质一定是纯净物b.由一种�属元素和一种非�属元素构成的物质一定是纯净物c.单质中只含有一种元素d Template




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tomski下列说法正确的是 a.只含一种元素的物质一定是纯净物b.由一种�属元素和一种非�属元素构成的物质一定是纯净物c.单质中只含有一种元素d coloring