Their efforts to improve the production have been very _________,and they have been praised by the
题目
Their efforts to improve the production have been very _________,and they have been praised by the
A.effective
B.efficient
C.effect
D.affective答案是那个
答案
a.effective
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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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