感谢朋友教会我成绩的英语作文怎么写
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感谢朋友教会我成绩的英语作文怎么写
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It is a celebrating day.I got in touch with Michael whom I have been losing contact for one year.It is really magic.I was searching online aimlessly yesterday when an idea struck me suddenly:since Ben...
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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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