A.0.1-0.5MPa B.0.1-1.0MPa C.0.2-1.0MPa
A.99.8% B.99.7% C.99.9%
A.偶然誤差、系統(tǒng)誤差 B.過失誤差、系統(tǒng)誤差 C.偶然誤差、系統(tǒng)誤差、過失誤差