【简答题】(12 分)硫酸钠-过氧化氢加合物(xNa 2 SO 4 ·yH 2 O 2 ·zH 2 O)的组成可通过下列实验测定:①准确称取1. 7700 g 样品,配制成100. 00 mL 溶液A。②准确量取25. 00 mL 溶液A,加入盐酸酸化的BaCl 2 溶液至沉淀完全,过滤、洗涤、干燥至恒重,得到白色固体0. 5825 g。③准确量取25. 00 mL 溶液A,加适量稀硫酸酸化后,用0. 02...
【简答题】A.School violence has nothing to do with the educational system. B.Schools should stop trying to raise scores. C.Schools should treat every student equally. D.Schools should divide students into 'winn...