A.±1cm,0.038mm B.-1cm,0.038mm C.±2cm,0.038mm D.+2cm,0.038mm
A.-3% B.±3.5% C.±3% D.+3.5%
A.2.5m,-2.5cm B.2.5m,-2cm C.1.5m,-2cm D.1.5m,-2.5cm