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ZX-B8C5167D3CPercentages · 第 13 题
Percentages · 原库模块 1 · Q13 原库参考解析
According to a set of standards, a certain type of substance can contain a maximum of 0.001% phosphorus by mass. If a sample of this substance has a mass of 140 grams, what is the maximum mass, in grams, of phosphorus the sample can contain to meet these standards?
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