A.讀數(shù)誤差 B.照準(zhǔn)誤差 C.鋼尺尺長(zhǎng)改正 D.對(duì)中誤差
A.±0.2m B.±0.1m C.±0.02m D.±0.01m
A.3 B.19 C.20 D.32