12.某化学兴趣小组的同学为测定假黄�组成元素的质量分数称取20克假黄�置于烧杯中用某浓度的稀盐酸50克分5次加入每次充分反应后取出 Template




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tomski12.某化学兴趣小组的同学为测定假黄�组成元素的质量分数称取20克假黄�置于烧杯中用某浓度的稀盐酸50克分5次加入每次充分反应后取出 coloring