英文作文 怎么用facebook 70单词左右
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英文作文 怎么用facebook 70单词左右
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Someone asks me how to use facebook.What?you don't know how to use it?That's a suprise.That's the same thing as you are telling me that you don't know how to use a phone.What's a phone?Oh,you really d...
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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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