000  $anz n  2
000  $a주제어
001  $aKSH1998000320
005  $a20021024173259
008  $a980429 n azknnaabn          |a a|a    | 
150  $a2단계 변조[二段階變調]
450  $wr$i영어$abi-phase modulation
550  $wg$a변조(통신)[變調]
550  $a텔레커뮤니케이션[telecommunication]