单项选择题
A.0 B.1% C.2% D.3%
A.0.2S,2.0,0.2,0.2S B.0.2,2.0,0.2,0.2 C.0.5S,2.0,0.2,0.5S D.0.5,2.0,0.2,0.5。
A.调前误差 B.调后误差 C.化整后 D.平均误差。