平面应力状态中,若σy=0,σx≠0,τx≠0,则第四强度理论的相当应力σr4为() 发布时间:2018-02-09 09:14 │ 来源:www.tikuol.com 题型:单项选择题 问题: 平面应力状态中,若σy=0,σx≠0,τx≠0,则第四强度理论的相当应力σr4为()。A.AB.BC.CD.D
题型:单项选择题 In the next 30 years, we could see more heat waves like_____ now occurring in the US or the kind that swept across Europe in 2003 that caused tens of thousands of deaths.A.thoseB.thatC.thisD.the one 查看答案