英语作文 我的老师
题目
英语作文 我的老师
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I have lots of teachers, but Mr Wang is my favourite teacher. He has been teaching English for more than ten years since he came to our school. He is tall and thin. He is kind, warm-hearted and he is...
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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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