英语作文The importance of good manners
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英语作文The importance of good manners
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Good manners cost us nothing but can buy everything.They help us to win friends and also conquer our enemies.They tend to make the world a happier place to live in by reducing friction and avoiding te...
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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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