如图，在矩形ABCD中，点F在边BC上，且AF=AD，过点D作DE⊥AF，垂足为点E
— I don’t like this kind of clothes because it is out of date.
—Never mind. There are many new ones. Please come here to have a look.
下图为我国某地农业生产活动场景图。读图，回答。该地区农业生产（ ）
海王星的发现是根据
□○□＝□（个）____
答：小明挂了____个。
