先试试这个
Command: pedit
Select polyline or [Multiple]: m
Select objects: all
4 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>: 0.0001
3 segments added to polyline
Enter an option [Close/Open/Join/Width/Fit/Spline/Decurve/Ltype gen/Undo]: