You may take this book away ______ you return it on time. A. as soon as B. so possible as C. as long as D. as far as 答案:C甲、乙、丙三位同学分别取铁粉和铜粉的均匀混合物与某稀硫酸反应,所得数据如下: 甲 乙丙甲取用金属混合物的质量(g)101020甲取用稀硫酸的质量(g)100120100甲反应后过滤得到干燥固体的质量(g)2212计算:(1)金属混合物铁的质量分数;(2)甲制得硫酸亚铁的质量.