英语小故事 要短,最好是20来个单词的
题目
英语小故事 要短,最好是20来个单词的
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答案
Peter and Mike are very good friends, every day they go to school together, play football together, do their homework together, until one day they are not friends anymore. Because they love a girl tog...
举一反三
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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