頻率分布 duration curve: (持續(xù)曲線)歷時(shí)曲線; 杜拉鈉延時(shí)曲線; 延時(shí)曲線annual load-duration curve: 年負(fù)荷歷時(shí)曲線average duration curve: 平均歷時(shí)曲線daily duration curve: 日持續(xù)曲線depth-duration curve: 深時(shí)曲線下載手機(jī)詞典可隨時(shí)隨地查詞查翻譯