A、20.8,0.03 B、20.7,0.02 C、20.8,0.02 D、20.7,0.03
A、過失誤差 B、隨機誤差 C、系統(tǒng)誤差 D、偶然誤差
A、1/4~1/6 B、1/3~1/4 C、1/5~1/8 D、1/2~1/3