000  $anz n  2
000  $a주제어
001  $aKSH1998033266
005  $a20000321010319
008  $a980429 n azknnaabn          |a a|a    | 
150  $a블록 레벨 접근
450  $wr$i영어$ablocked level access
550  $a블록(컴퓨터)[block]