问题: duty report 急
英语的一篇小文章即可,内容不限. 急!!!!!!11
解答:
Why Is Icy Slippery
When calm water freezes,it makes ice with a smooth surface,such as the
surface of an ice cube.It usually also feels slippery because the warmth
of your touch melts a little of the surface.In the case of an ice cube,it
makes a film of water between the ice and your hand.So it's hard to get a firm grip on the ice itself.
There is one condition in which ice can stick to you,and that is when the ic is much,much colder than just freezing.If you touch an ice cube with your finger,the ice cube will stick tightly to your finger by
freezing a little of the skin.Some people have experienced this when they
touch a piece of icy metal that was outside when it was very cold.But it
can hurt,so please don't try it.
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