when were electric slippers invented?who were they invented by?what are they used for?什么意
题目
when were electric slippers invented?who were they invented by?what are they used for?什么意
答案
电子拖鞋(electric slippers)是什么时候发明的?谁发明的它们?它们是用来做什么的?
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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