Please tell me __ you ___ the city.Only a week
题目
Please tell me __ you ___ the city.Only a week
A how long;have been to
B how many times;have been to
C how long;have been in
D how often;have been
答案
C how long;have been in
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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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