英语作文:Why does an ice cube float?
题目
英语作文:Why does an ice cube float?
帮忙写这个作文啊...
答案
Why does an ice cube float?
Water has three different shapes with fluid,solid and steam.When we freeze water with a temperature below zero,water can be changed into ice.It is turned into a solid form.But during the process of freezing,there will be some air coming into the water and making an ice cube which is much bigger than it in a fluid form.Therefore,an ice cube is much bigger than water in size.That is why you can see a bottle of water will break up the bottle when the water is frozen into ice.Finally,just because the ice cube is much bigger than the water with the same weight,then,it can float on the surface of the water.
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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