A.權(quán)倒數(shù)較大 B.權(quán)倒數(shù)較小 C.任一權(quán)倒數(shù) D.權(quán)倒數(shù)平均值
A.9" B.10" C.13" D.15"
A.±5mm B.±3mm C.±8mm D.±10mm