000  $anz n  2
000  $a주제어
001  $aKSH1998042791
005  $a19980629115215
008  $a980629 n azknnaabn          |a a|a    | 
150  $a광증폭[光增幅]
450  $wr$i영어$alight amplification
550  $wg$a증폭[增幅]
550  $a광 증폭기[光增幅器]
550  $a광신호[光信號]