A.l²cosα B.k²l²cosα C.k²l²cos2α D.l=下絲讀數(shù)-上絲讀數(shù)
A.0.013m B.-0.013m C.0.025m D.-0.025m
A.溫度改正數(shù)為負(fù) B.溫度改正數(shù)為正 C.溫度改正數(shù)為零 D.不需改正