新概念英语1,53课课文
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新概念英语1,53课课文
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HANS:Where do you come from?JIM:I come from England.HANS:What's the climate like in your country?JIM:It's mild,but it's not always pleasant.The weather's often cold in the North and windy in the East....
举一反三
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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