关于旅游的英语作文100个单词的
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关于旅游的英语作文100个单词的
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In last summer vacation ,I went to Beijing with my family.First ,we went to the Great Wall,where we met a lot of foreigners and we also took a lot of photos.They all like our culture and beautiful sen...
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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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