describe a change in your country.It could be a social,political or economical change.
题目
describe a change in your country.It could be a social,political or economical change.
托福口语题,
答案
Personally,I would have to say that the subway,which develops rapidly during the past two decades in my country,is an encouraging change that has a positive influence on social life,and there are a co...
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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．
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