We dislike people ______ talk much but never do anything.
A:whom
B:which
C: who
D:whose
南宁市3、4月份会出现会返潮现象,称之为“回南天”。“回南天”的时候墙壁会“出水”,请根据所学的知识解释一下墙壁“出水”现象。
D 为 AC 的中点, AB⊥B1D .
解下列方程: