题目

体积相同，浓度均为0.1 mol/L的NaOH溶液、氨水，分别加水稀释m倍、n倍，溶液的pH都变成9，则m与n的关系为A．4m＝n                    B．m＝n                  C．m＜n                        D．m＞n  答案：D解析: —________is your new English teacher?—The man under the tree, he is with Mr.Gao.A.Where B.Which C.Whose D.What