英语翻译
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英语翻译
The term oil field is also used as a shorthand to refer to the entire petroleum industry,however,it is more accurate to divide the oil industry into three sectors:upstream (crude production from wells and separation of water from oil),midstream (pipeline and tanker transport of crude) and downstream (refining and marketing of refined products).
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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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