If KEYOPT(1) = 0 (default), the element is a rigid link with two nodes and three degrees of freedom at each node (UX, UY, UZ). If KEYOPT(1) = 1, the element is a rigid beam with two nodes and six degrees of freedom at each node (UX, UY, UZ, ROTX, ROTY, ROTZ).ANSYS的帮助文件里有上面一段,不知道KEYOPT(1) = 0 (default), 和KEYOPT(1) = 1分别是什么意思,请高手赐教,我是新手.