英语励志小短文~
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英语励志小短文~
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Life is hard.We should not give up hope.By the time we have given up,we are finished.Chances are always there.We have to grab every single opportunity...to help,to love and to serve.To live our life h...
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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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