________people in the world are sending information by e-mail every day.如题
题目
________people in the world are sending information by e-mail every day.如题
________people in the world are sending information by e-mail every day.A.several B.many millions C several millions D many million
答案
A 其余选项后面要跟of才对.
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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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