情况单纯的话,先试这个办法
Command: pedit
Select polyline or [Multiple]: m
Select objects: All 6 found
Select objects:
Enter an option [Close/Open/Join/Width/Fit/Spline/Decurve/Ltype gen/Undo]: j
Join Type = Extend
Enter fuzz distance or [Jointype] <0.0000>: 17 ;<--这个依实务调整
4 segments added to polyline
Enter an option [Close/Open/Join/Width/Fit/Spline/Decurve/Ltype gen/Undo]: