短語詞組短語truss s element 桁架桿元equivalent truss element 等效鉸結(jié)桁架單元space truss element 空間桿元equivalent plane truss element 等效平面桁架單元Rectangle truss element 矩形桁架單元truss segment finite element 桁段有限元space prism truss element 空間棱柱體形桁架單元plane rectangle truss element 平面矩形桁架單元 返回 truss element