00000nz  a2200000n  4500
001  KSH1999021337
005  19991204183837
008  991204 n azknn|abn          |a a|a    | 
150  ▼a부피드백[負--]▲
450  ▼a부궤환[負饋還]▲
450  ▼a음되먹임[陰--]▲
450  ▼wr▼i영어▼anegative feedback▲
550  ▼wg▼a피드백(환류)[feedback]▲
550  ▼a정피드백[正--]▲