笫9章程序\Ext_frmnt.m .........\pr9_2_1.m .........\pr9_3_1.m .........\pr9_3_2.m .........\pr9_4_1.m .........\pr9_4_2.m .........\pr9_5_1.m .........\pr9_5_2.m .........\seekfmts1.m .........\snn27.wav 笫9章程序