00000nz  a2200000n  4500
001  KSH2000002374
005  20000126184236
008  000126 n azknn|abn          |a a|a    | 
150  ▼a등치법[等置法]▲
450  ▼wr▼i영어▼amethod of equivalence▲
550  ▼a연립 방정식[聯立方程式]▲