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力學問題
Oct 24th 2014, 19:58, by et0331cd

作者et0331cd (倫)

看板Examination

標題力學問題

時間Fri Oct 24 19:58:13 2014

http://i.imgur.com/DvPHA63.jpg
http://i.imgur.com/9nyffb2.jpg
此題的txy為何不是負的 其他力了解 但這不懂為什麼？ -- Sent from my Android -- ※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 42.79.190.62 ※ 文章網址: http://www.ptt.cc/bbs/Examination/M.1414151896.A.24D.html

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