what is the influence of Black Death
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what is the influence of Black Death
答案
The Black Death is the illness that killed large numbers of people in Europe and Asia in the 14th century.The Black Death is estimated to have killed 30% – 60% of Europe's population,reducing the wor...
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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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