—The children in rural areas have few books to read. Let's ______ some books to them.—Great, it is a good idea.
尝是一种观察方法,但是在不知道是什么液体时,千万不能随便尝试。( )
在正方形ABCD中,点E,F分别在边BC,CD上,且∠EAF=∠CEF=45°.