A.10~20,2~4 B.12~22,3~5 C.15~25,4~6
A.沉降觀測(cè) B.傾斜觀測(cè) C.動(dòng)態(tài)觀測(cè)
A.±50mm,+400mm,2‰ B.±100mm,+500mm,3‰ C.±150mm,+600mm,4‰