鲁滨孙漂流记内容梗概英文的,
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鲁滨孙漂流记内容梗概英文的,
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Robinson Crusoe, the narrator of the story, tells us that he was born in 1632 in the city of York, England. His father, a German immigrant, married a woman whose name was Robinson, and his real name w...
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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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