機械力學請教 - 國營工作討論

By Jacky
at 2021-08-11T18:56
at 2021-08-11T18:56
Table of Contents
https://i.imgur.com/9s6yU6T.jpg
https://i.imgur.com/BSbjI5x.jpg
請教為何是70*4,不是應該為70*5嗎?
合力點距離支點應該是5為何是4?
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https://i.imgur.com/BSbjI5x.jpg

請教為何是70*4,不是應該為70*5嗎?
合力點距離支點應該是5為何是4?
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國營
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