用英语写一篇小作文《秋天》小学水平
题目
用英语写一篇小作文《秋天》小学水平
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Ladies and gentlemen,Welcome to our New Century Net-school!Our net-school is made up of four parts.A Multimedia Teaching System makes teaching and learning earsier,and much more interesting.Students c...
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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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