000  $anz n  2
000  $a주제어
001  $aKSH1997000757
005  $a19970624213654
008  $a970624 n azknnaabn          |a a|a    | 
150  $a단위원[單位圓]
450  $wr$i영어$aunit circle
550  $wg$a원(기하학)[圓]