题目

将200g石灰石与足量的盐酸反应,共收集二氧化碳66g.求:该石灰石中CaCO3的质量分数多少? 答案:75%________ not to miss the flight at 15:20, the manager set out for the airport in a hurry. [     ]A.Reminding  B.RemindedC.To remind  D.Having reminded
化学 试题推荐