彈性中心法methodofentasis: 收分法methodofeconomiccalculation: 經(jīng)濟(jì)核算方法 經(jīng)濟(jì)核算方法methodofequalweightsu titution: 等權(quán)代替法methodofdirectiono ervation: 方向觀測法methodoffrostprotection: 防霜法下載手機(jī)詞典可隨時隨地查詞查翻譯