一个dxf文件

clf1121

以下是我自己写的多线段构成的多边形的dxf文件,但是CAD中无法打开,好像还缺点什么?请问如何改正? 0
SECTION
2
ENTITIES
0
LWPOLYLINE
8
AcDbPolyline
10
218.0582368794609
20
188.2185629848099
10
324.8622718048991
20
204.817365230124
10
389.5380487715751
20
132.4940118489264
10
321.8954930215882
20
108.78143701519
10
210.3446130618574
20
111.7455092151606
10
218.0582368794609
20
188.2185629848099
0
ENDSEC
0
EOF