The dentist in(in the Balck Street)is sitting in an armchair near the fire.——对括号内的部分提问
题目
The dentist in(in the Balck Street)is sitting in an armchair near the fire.——对括号内的部分提问
答案
Which dentist is sitting in an amchair near the fire?
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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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