基本解釋[經(jīng)濟(jì)學(xué)]有限壽命區(qū)詞組短語短語finite element technique life region 有限壽命區(qū)finite life region更多詞組專業(yè)釋義經(jīng)濟(jì)學(xué)有限壽命區(qū)