Universal pH paper is a special type of paper that contains an indicator that can change color when exposed to an acid or base. The colors that the paper can change, depending on the pH, include red, yellow, green, blue, or purple....
搜索智能精选 题目下列分子或离子中都存在着配位键的是( )NH3、H2O NH4+、H3O+ N2、HClO [Cu(NH3)4]2+、PCl3 答案B