听力原文:M: I think I need a new tire. I had to put air in it twice this week. W: That happened to me once. It has just a nail, and they were able to repair it. Q: What does the woman mean? (18)
【简答题】K 2 SO 4 是无氯优质钾肥,Mn 3 O 4 是生产软磁铁氧体材料的主要原料。以硫酸工业的尾气联合制备K 2 SO 4 和Mn 3 O 4 的工艺流程如下: (1)几种盐的溶解度见图。反应III中,向(NH 4 ) 2 SO 4 溶液中加入KCl溶液充分反应后,进行蒸发浓缩、 、洗涤、干燥等操作即得K 2 SO 4 产品。 (2)检验K 2 SO 4 样品是否含有氯化物杂质的实验操作是: 。...