*Vertices 5
1 "焊接学报" 0.0 0.0 0.0 x_fact 6.626506 y_fact 24.246988
2 "中国机械工程" 0.0 0.0 0.0 x_fact 1.656627 y_fact 26.204819
3 "电焊机" 0.0 0.0 0.0 x_fact 11.144578 y_fact 23.192771
4 "焊接" 0.0 0.0 0.0 x_fact 6.174699 y_fact 9.789157
5 "焊接技术" 0.0 0.0 0.0 x_fact 13.403614 y_fact 16.566265
*Matrix 
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