If vertical angles of inclined sights do not exceed 10° and non-verti – McqOptions

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1.	If vertical angles of inclined sights do not exceed 10° and non-verticality of the staff remains within 1°, stadia system of tacheometric observations are made on
A.	staff normal
B.	staff vertical
C.	staff normal as well as vertical
D.	none of these.
Answer» B. staff vertical

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