如图所示,直径为D1=0.5m的铁道路标圆形信号板,自重不计,固结在外径D=0.2m的空心圆弯杆上,信号板受到与其板面相垂直的最大均匀风载p=20Kn/m2,圆弯杆的材料许用应力为[σ]=60MPa,试按第三强度理论设计空心圆弯杆内径d的最大值。 高老师1年前 (2024-10-05)工程力学(一)(02159)17
按照综合调整法,如果新项目与类比项目所需资源是一样的,但是新项目所需资源的价格上涨了20%,此时按( )比例调整即可
I was shocked by the number of people who seemed to have nothing better to do with their time than( )to know fish better.