In leveling, the correction for curvature (in meters) is equal ............

Indirect ranging is adopted when the two ends of chain line are ............

In a whole circle system, the bearing of a line is measured ............

The capacity of a telescope of producing a sharp image is called its ............

A lemniscate curve between the tangents is transitional throughout, if the polar deflection angle of its apex is equal t…

Contour lines look to cross each other in case of ............

To avoid large centering error with very short legs, observations are generally made ............

The operation of turning the table so that all the lines on the paper are parallel to the corresponding lines on the gro…

A level line is ............