寻一篇英语作文《每个人都需要帮助》
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寻一篇英语作文《每个人都需要帮助》
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People often say'A friend in need is a friend indeed.'(患难见真情).So I think everyone needs help.I have a friend called Joan.We often help each other.One day after school,it was raining hard and I le...
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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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