Our sitting room作文
题目
Our sitting room作文
答案
Welcome to my home!This is my sitting-room.There is a bookcase,a fridge,a table,a sofa and a TV.The telephone is on the desk.Three chairs are besides the table.Mum always sits on the sofa.Watching TV ...
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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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