特殊用法compound catenary1.双重键线, 双重悬键线elliptic catenary1.椭圆悬链线hyperbolic catenary1.双曲悬链线single catenary1.单链线, 单悬链线simple catenary1.单吊线spherical catenary1.球面悬链线transformed catenary1.变形悬链线catenary of equal resistance1.等阻悬链线, 等阻悬索线