_________have you been traveling Since I was a boy
题目
_________have you been traveling Since I was a boy
A Since when
B When
C For when
D How much
答案
A
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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．
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