狗狗是我们的朋友英语作文九十词
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狗狗是我们的朋友英语作文九十词
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Nowadays there are so many animals out there make people in real life happier.Dog is the best example to identify.As many people believe dog is man's best freind,this is very true.It not just entertai...
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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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