关于ecosystem,humans,food的200字英语作文,急
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关于ecosystem,humans,food的200字英语作文,急
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We need actionNowadays ,the problem of pollution and depletion is becoming more and more urgent .We take as much as we like fron the Nature and dump rubbish which threatens to overwhelm our earth ,wit...
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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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