用英文简单的给我介绍一下great wall.please…80个单词以内
题目
用英文简单的给我介绍一下great wall.please…80个单词以内
答案
The Great Wall of China is a series of fortifications made of stone, brick and other materials, generally built along an east-to-west line across the historical northern borders of China to protect th...
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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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