关于Learning how to relax yourself is essential to being happy.解析说：is essential to ,to是介词,所以加了being ha
题目
关于Learning how to relax yourself is essential to being happy.解析说：is essential to ,to是介词,所以加了being happy.但不是有词组是It is essential to do sth.为什么这里就是essential加to do?
答案
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
最新试题
热门考点