题目

下列各组中化合物的性质比较，不正确的是 A．酸性：HClO4＞HBrO4＞HIO4           B．碱性：NaOH＞Mg(OH)2＞Al(OH)3 C．稳定性：PH3＞H2S＞ HCl             D．非金属性：F＞O＞S 答案：CWhen I think something is right, I will stick to that ,sometimes it sounds a little          but I am now trying to find a balance between insistence and compromise.     A. reliable         B. artificial           C. intelligent          D. stubborn