double decomposition
柯林斯詞典
1. N a chemical reaction between two compounds that results in the interchange of one part of each to form two different compounds, as in AgNO3 + KI → AgI + KNO3 復(fù)分解; 兩種化合物互相交換成分，生成另外兩種化合物 (Also called metathesis)
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