單項選擇題
A.21.4″ B.-21.4″ C.20.6″ D.-20.6″
A.視準軸水平,且與儀器豎軸垂直 B.視準軸與水準管軸平行 C.視準軸水平 D.視準軸與圓水準器軸垂直
A.水準管軸平行于視準軸 B.視準軸垂直于豎軸 C.視準軸垂直于圓水準軸 D.豎軸平行于圓水準軸
A.0.5m B.0.2m C.0.3m D.1m
A.5m B.3m C.1m D.10m
A.20cm B.10cm C.5cm D.25cm
A.0 B.100 C.4687或4787 D.不確定
A.2mm B.3mm C.5mm D.10mm
A.0.1m B.0.2m C.0.3m D.0.5m