英文小故事150字左右---英语高手进
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英文小故事150字左右---英语高手进
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一篇寓言故事Who Deserves Help?Many years ago,there lived a very rich man who wanted to do something for the people of his town.But first he wanted to find out whether they deserved his help.So he plac...
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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