短語詞組短語null data set [計]空數(shù)據(jù)組;空數(shù)據(jù)集;翻譯null off set 零點偏移null -set 零集function theoretic null -set [數(shù)]函數(shù)論的零集function -theoretic null-set 函數(shù)論的零集null set of class [數(shù)]類的零集l null set l 零集null off -set 零點偏移;零點漂移 返回 null set