The 90 billion buckets of oil which is expected to be in the Arctic could meet current world oil dem
题目
The 90 billion buckets of oil which is expected to be in the Arctic could meet current world oil demand of 86.4 million buckets a day for almost the years.
答案
预计能在北极提炼出的9百亿桶石油将能满足目前全世界每天8千6百4十万桶的需求达数年.
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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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