A:①③④
B:①②③
C:②③④
D:①②③④
Mrs. Li gets up at 6:30. She gets up very early every day.
小刚因考试成绩不理想很伤心,自习课上在教室里大哭起来,还撕坏了小红的课本。
常温时,pH=14和pH=10的两种NaOH溶液等体积混合,所得溶液中c(H+)是( )