CBA EAAAD 0120 74151Y D F D 23 D4 D5 D 6 D 67 图4225(a)8 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 A B C F 图 4.2.25 ( a )