While reading dxf file ********.dxf
the following unsupported items were encountered:
line number 848: Unknown group code: 370.
line number 860: Unknown group code: 290.
line number 876: Unknown group code: 290.
。
。
。
line number 3206: Unknown group code: 310.
line number 3208: Unknown group code: 310.
line number 3210: Unknown group code: 310.
line number 3212: Unknown group code: 310.
line number 3214: Unknown group code: 310.