what is a cell?why is it important>?
题目
what is a cell?why is it important>?
答案
I have to say,it's a big question.And I guess you didn't ask for clearly.Because cell could be used in biology,in database,or something else.(我不得不说,你问的问题有点大.而且问的不是很清楚.因为cell这...
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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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