弹簧是机械和电子行业中广泛使用的一种弹性元件，弹簧在受载时能产生较大的弹性变形，并把机械功或动能转化为变形能，而在卸载后弹簧的变形消失并回复到原状，同时将变形能转化为机械功或动能。弹簧的载荷与变形之比称为弹簧刚度，刚度越大，则弹簧越硬。

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