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所谓平均值法，就是首先求出混合物中某组分的平均值，以此来确定混合物组成的方法。该法对于确定含相同元素的物质形成的混合物的物质成分时特别有效。例题由氧化镁和另一金属氧化物组成的混合物4克，已知含有氧元素1．8克，则另一金属氧化物是（）。（A）C［JO（B）FeZO3（C
The so-called average method is to first determine the average value of a component in the mixture to determine the composition of the mixture. This method is particularly effective for determining the substance composition of a mixture formed of substances containing the same element. An example is 4 grams of a mixture of magnesium oxide and another metal oxide, known to contain 1.8 grams of oxygen, and the other metal oxide is (). (A) C[JO(B)FeZO3(C)