an unforgettable thing 英语作文80字 重点中学初二水平,>-
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an unforgettable thing 英语作文80字 重点中学初二水平,>-
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I still remember the time when I receive the beautifully packaged gift from my father. There was a nice dark blue pen inside the black little box with shining packing paper. My father gave it to me be...
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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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