Songjiang Professional Mandarin Tutor Your Satisfaction is our goal
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Songjiang Professional Mandarin Tutor Your Satisfaction is our goal
Not only help you break down the language barrier and bridge the cultural gap,also stand by your side and consider every tiny detail for you!
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songjiang普通话导师,您的满意就是我们的目标
不仅可以帮助你打破语言的障碍和文化鸿沟的桥梁,也站在你的身旁,为您考虑每一个微小的细节!
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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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