There is a picture.With many teeth on its sides it is afriend of a lettter.With it,a letter gose ove
题目
There is a picture.With many teeth on its sides it is afriend of a lettter.With it,a letter gose over the world.What is it?
答案
It's a stamp
邮票啦,邮票边边都有齿,用邮票才可以寄信啊,邮票也可以go over the world
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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