Pgh Post Gazette Obits For Today Advance Pittsburgh
Pgh Post Gazette Obits For Today Advance Pittsburgh Overview
知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。知乎凭. 前言 p = f s p=f/s 是压强的定义式，也是决定式， 固/液/气都适用。 (只要能计算出f，知道底面积s都能使用) 需要注意的是 f 表示的是垂直作用在受力面积s上的压力，它 不一定等于重力.
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