请计算某焊接结构的焊接接头承受动载荷,且反复多次作用,欲求其应力振幅σa及应力循环特性系数r。
参考答案:
应力振幅σa为60Mpa,应力循环系数r为0、75。
North points up, south points ____________.[ ]
A. left
B. down
C. right
The contact group is a group of nations that concern the future status of Kosovo.