[理工] 材料力学 扭矩 剪应力的问题

楼主: hello789 (Echo)   2016-07-03 00:59:10
http://i.imgur.com/NkLkJCy.jpg
http://i.imgur.com/IpxQF9p.jpg
http://i.imgur.com/X8XC2lu.jpg
大家好
想请问图中扭矩跟剪应力正负号要怎么分辨?
麻烦解答~
感激不尽

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