英语谜语(回答的人,请用英语来回答)谢谢
题目
英语谜语(回答的人,请用英语来回答)谢谢
1.It's a small picture with teeth around it.It has no feet,but it can travel aroung the world.What is it?
2.I have cities but no houses;forests but no tree;rivers without water.What am
3.If you have it,you want to share it.If you share it,you don't have it.What is it?
答案
clock
map
dream
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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