55.the bike hit a rock and____
题目
55.the bike hit a rock and____
A.laid out B.turned over C.current D.frequent
56.is he the___Dean of the Department of Economics?
A.tapical B.average C.current D.frequent
答案
56.is he the___Dean of the Department of Economics?
C.current 目前的,在任的.
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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