000  $anz n  2
000  $a주제어
001  $aKSH2001009595
005  $a20021125000000
008  $a010523 n azknnaabn          |a a|a    | 
150  $a불순물 준위[不純物準位]
450  $a국재 준위[局在準位]
450  $wr$i영어$aimpurity level
550  $wg$a준위(물리학)[準位]
550  $a불순물[不純物]