cheer
题目
cheer
答案
cheer up (使)高兴起来,(使)振作起来Cheer up!It can't be as bad as all that.振作起来!情况不会那么糟.She cheered up after we had been to see her.我们去看她后,她感到很高兴.The news cheered him up.这消息使...
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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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