000  $anz n  2
000  $a주제어
001  $aKSH1998037340
005  $a19980429160817
008  $a980429 n azknnaabn          |a a|a    | 
150  $a양극성 펄스
450  $wr$i영어$abipolar pulse
550  $wg$a펄스[pulse]
550  $a양극성[兩極性]