KEYOPT,3,1,0 1是Number of the KEYOPT to be defined(KEYOPT(KNUM) 定义KEYOPT号0是Value of this KEYOPT 确定这个号的值1,0表示的是 Linear solution(default) 线性求解KEYOPT,3,2,22,2表示的是1-D longitudinal spring-damper(UY degree of freedom) 一维纵向弹性阻尼(UY方向的自由度)