Since 1949,when the People’s Republic of China was founde,it is not the first time for China to deve
题目
Since 1949,when the People’s Republic of China was founde,it is not the first time for China to develop its western part.从上句可知,中国是在什么时候进行第一次发展西方地区
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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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