機械設計的問題 - 考試

By George
at 2016-05-11T15:35
at 2016-05-11T15:35
Table of Contents
http://i.imgur.com/4iMYBWp.jpg
http://i.imgur.com/HF3e8VN.jpg
第一題的解答中
6x=32Mz/pi*d^3 = -318.31Mpa
為什麼是負的?
請解惑一下,謝謝。
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