A.80% B.85% C.90% D.100%
A.鋼尺量連續(xù)三擋,取最小值 B.鋼尺量連續(xù)三擋,取平均值 C.鋼尺量連續(xù)三擋,取最大值 D.鋼尺量連續(xù)五擋,取平均值
A.50B.60C.100D.200