A.水準管軸垂直于豎軸,即LL⊥VV B.視準軸垂直于橫軸,即CC⊥HH C.橫軸垂直于豎軸,即HH⊥VV D.視準軸垂直于圓水準器軸,即CC⊥L′L′
A.橫軸垂直于豎軸 B.視準軸垂直于橫軸 C.水準管軸垂直于豎軸 D.視準軸垂直于豎軸
A.8″ B.9″ C.13″ D.24″