关于天气的英语作文怎么写
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关于天气的英语作文怎么写
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The weather is a set of all the phenomena in a given atmosphere at a given time.It also includes interactions with the hydrosphere.The term usually refers to the activity of these phenomena over short...
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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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