A.DJ05經(jīng)緯儀 B.DJ1經(jīng)緯儀 C.DJ2經(jīng)緯儀 D.DJ6經(jīng)緯儀
A.7.5m B.5.0m C.2.0m D.1.5m
A.往返測 B.單程觀測 C.單程雙測站