it good for students to use mobile phone at school
题目
it good for students to use mobile phone at school
答案
Nowadays,almost everyone has a mobile phone,and increasing numbere of students take phones to school.However,is it good for students?It has been heated discussed.Many people are against students take ...
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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