(A)系統(tǒng)誤差和隨機(jī)誤差 (B)允許誤差和相對(duì)誤差 (C)粗大誤差和系統(tǒng)誤差 (D)相對(duì)誤差和絕對(duì)誤差
(A)3t (B)30t (C)300kg (D)3000kg
(A)1~2只 (B)4~6只 (C)8~12只 (D)12~24只