To put it simply: the fundamental mechanism of elasticity is due to the stretching of inter-atomic/molecular distance, without breaking the bonds. Rubber molecules are "chained" together, like a bundle of entangled "springs". When stretched, they behave just like a spring.
哈哈哈哈 O(∩_∩)O哈哈~ 好久不来了，不小心看了一眼自己主页，发现自动关联了自己以往发过的帖，点进这个看了一眼，笑个半死。。。敢情我当初还发过这么搞笑的东西啊，我自己完全不记得了 
雷达卡
发表于 2005-11-19 18:51:08
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千斤顶
发表于 2005-11-20 22:28:59
不知yma16的问是否另有含义?
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