题目

I think Susan writes than any other student, but the teacher says Joe writes in the class. A . more carefully; carefully B . the most carefully; carefully C . the most carefully; the most carefully D . more carefully; the most carefully 答案：D某工厂排放的工业废水中可能含有K+、H+、Mg2+、SO42-、Cl-、NO3-等离子。经检测废水呈明 显的碱性,则可确定该厂废水中肯定不含有的离子组合是A．H+、Mg2+ B．K+、NO3-、SO42-C．H+、K+、NO3- D．K+、Mg2+、SO42-、Cl-