人与人互相帮助的英语作文
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人与人互相帮助的英语作文
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Most of us have had an experience which reminds us the world is getting smaller. Perhaps when you went to some place far away from the city you live in and thought you knew nobody there, you were surp...
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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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