如何使用e-mail(用英文书写)
题目
如何使用e-mail(用英文书写)
描述性,电子邮件的作用是什么
用英文叙述
答案
Email is a very convenient tool to send and receive mail via the internet.People can exchange information by sitting in the office or at home without going outside.And the email is even better than telephone in some aspects.The email can record everything but the phone can't.
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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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