一篇介绍南京的英语短文
题目
一篇介绍南京的英语短文
80词左右就够了
答案
Nanjing is the capital of China's Jiangsu Province and a city with a prominent place in Chinese history and culture.Nanjing has served as the capital of China during several historical periods,and is ...
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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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