介绍妈妈英语作文?
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介绍妈妈英语作文?
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my mother is a doctor. She has long curly hair. she is beautiful. she works in the biggest hospital in our city. she works very hard Everyday she gets up very early , First she makes breakfast for o...
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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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