00000nz  a2200000n  4500
001  KSH1998006416
005  20000402010516
008  980429 n azknn|abn          |a a|a    | 
150  ▼a자유 진동[自由振動]▲
450  ▼wr▼i영어▼afree oscillation▲
550  ▼wg▼a진동[振動]▲
550  ▼a강제 진동[强制振動]▲