A Ao B A A2 0 D174151Y D F 2 D 3 D 4 D5 6 7 图4225(b)10 图 4.2.25 ( b ) 1 2 3 4 5 6 A B C D 1 2 3 4 5 6 D C B A Title Size Number Revision B Date: 19-Feb-2002 Sheet of File: C:\Program Files\Design Explorer 99 SE\Library\YangHengXin\MyDesign.ddb Drawn By: D D D D 0 1 3 4 1 2 D 74151 D A A A 2 0 EN Y 5 6 7 D D VC C C B A F