A.逐期增減量之差等于累計(jì)增減量 B.逐期增減量之和等于累計(jì)增減量 C.逐期增減量之商等于累計(jì)增減量
A.絕對(duì)數(shù)時(shí)間數(shù)列 B.相對(duì)數(shù)時(shí)間數(shù)列 C.平均數(shù)時(shí)間數(shù)列