表25PE和NE的频率矩阵 FM (PE) FM NE Ⅹ1X2Ⅹ3X4 Ⅹ1X2Ⅹ3X4 3204334 14 332 10132 2表2.5 PE和NE的频率矩阵 FM (PE) FM (NE) X1 X2 X3 X4 X1 X2 X3 X4 0 1 3 3 2 0 4 3 3 4 1 4 3 5 6 1 0 1 3 2 2 3 2 2 2 2