00000nz  a2200000n  4500
001  KSH1998020422
005  19980429133457
008  980429 n azknn|abn          |a a|a    | 
150  ▼a포토일렉트렛▲
550  ▼wg▼a일렉트렛▲
550  ▼a광전도체[光傳導體]▲
550  ▼a안트라센[anthracene]▲