*Vertices 5
1 "石油钻采工艺" 0.0 0.0 0.0 x_fact 6.786850 y_fact 14.422057
2 "钻井液与完井液" 0.0 0.0 0.0 x_fact 6.574761 y_fact 12.513256
3 "石油钻探技术" 0.0 0.0 0.0 x_fact 3.075292 y_fact 17.815483
4 "天然气工业" 0.0 0.0 0.0 x_fact 5.832450 y_fact 40.296925
5 "油田化学" 0.0 0.0 0.0 x_fact 3.287381 y_fact 14.952280
*Matrix 
0.000000 0.461487 0.387877 0.000000 0.403684 
0.461487 0.000000 0.307241 0.000000 0.538244 
0.387877 0.307241 0.000000 0.000000 0.000000 
0.000000 0.000000 0.000000 0.000000 0.000000 
0.403684 0.538244 0.000000 0.000000 0.000000