雪和冰的区别
题目
雪和冰的区别
间短一点,最好是英文说明
答案
Snow is frozen precipitation in the form of white or translucent hexagonal ice crystals that fall in soft,white flakes.Ice is frozen solid which feels colder and much harder than snow.
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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