模型可以反映客观现象简单明了地表示事物.某矿石样品中可能含有碳酸钙二氧化硅氧化铝氧化铁等化合物经测定各元素质量分数的模型如图甲.由此 Template




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tomski模型可以反映客观现象简单明了地表示事物.某矿石样品中可能含有碳酸钙二氧化硅氧化铝氧化铁等化合物经测定各元素质量分数的模型如图甲.由此 coloring