Improvment in health,education and trade are essential for the development of pooer nations
题目
Improvment in health,education and trade are essential for the development of pooer nations
for the development of pooer nations在句子中做很么成分,修饰什么
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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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