this is the longest rail line network in the world改写this is the longest rail line network
题目
this is the longest rail line network in the world改写this is the longest rail line network
答案
This is the longest rail line network over the world.This is the longest rail line network all the world.This rail line network is the longest in the world.This rail line network is the world's longes...
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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