帮忙写篇911消防员救人英文作文.字数随便
题目
帮忙写篇911消防员救人英文作文.字数随便
答案
Our heroes are the firemen of 9/11.They saved a lot of people which were trapped in the World Trade Center and the Pentagon.After the aircraft flew into the buildings they went in and saved as many pe...
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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