比如有两段线有一个交点，你利用by angle选择时，点击一条线就能把两条都选中 如果你不用By angle选择，那么你只能一条一条线去选
byangle andacceptthedefaultangle.Selectthesurface,highlightedin Figure4–33,todefinethefreebodycutcross-section.Fromthe Selection toolbar,toggleoffthe SelecttheEntityClosesttotheScreen tool andensurethatthe SelectFromAllEntities tool isselected.Asyoumovethecursorintheviewport,Abaqus/CAEhighlightsallofthepotent...