Exactly when the first people arrived in what we nom know as california no one really knows
题目
Exactly when the first people arrived in what we nom know as california no one really knows
为什么用what 详解...还有really后不应该用动词原形吗
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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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