关于濒临灭绝的大象文章 英文
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关于濒临灭绝的大象文章 英文
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The total elephant population has fallen to less than half a million and the numbers will continue to dwindle as long as they are under threat.There are several factors which are playing simultaneous ...
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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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