How to save the water的英语作文50词
题目
How to save the water的英语作文50词
答案
Water is very important in our life.We drink it every day and use it to cook and wash things.We can not live without water.But how can we save water?There are several ways to save water.Firstly,take s...
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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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