7.物质变化过程中常伴有以下现象其中一定是化学变化的是 A.固体变成无色液体 B.沉淀 C.块状固体变成粉末状固体 D.有燃烧现象 Template




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tomski7.物质变化过程中常伴有以下现象其中一定是化学变化的是 a.固体变成无色液体 b.沉淀 coloring