|詹姆斯007發表于 01-26 22:21可以參考一下《起重機設計手冊》<br>
<br>* l( r( S5 H! X+ h
<img src="http://www.whclglass.com.cn/data/attachment/forum/202101/26/222008rw8f88jfx4bfa2ax.jpeg" border="0" alt=""><br>
歡迎光臨 機械社區 (http://www.whclglass.com.cn/) | Powered by Discuz! X3.5 |