急需一篇写汶川地震经过的作文,UNFORGETTABLE EXPERIENCE.80-100字
题目
急需一篇写汶川地震经过的作文,UNFORGETTABLE EXPERIENCE.80-100字
答案
An unforgettable experience Usually,the first time you did something is unforgettable,although it couldn't be always wonderful.As for me,an unforgettable experience of mine is the first time I joined ...
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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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