回答这个问题.what is fresh water?用英语
题目
回答这个问题.what is fresh water?用英语
答案
Fresh water is defined as water with less than 0.5 parts per thousand dissolved salts.[1] Freshwater bodies include lakes,rivers,and some bodies of underground water.The ultimate source of fresh water...
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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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