It is the uses to which it is put that determines its value to society怎么理解
题目
It is the uses to which it is put that determines its value to society怎么理解
答案
它的作用决定了它对社会的价值
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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