The traversing by the method of deflection angles is chiefly used in ............

A diagonal scale is used to read ............ dimensions.

The index glass in an optical square is ............

Can the vertical axis coincide with any other axis in any position of telescope?

Contour lines cross ridge or valley lines at ............

A plumb line is ............

The method of plane tabling commonly used for establishing the instrument stations only is a ............

Overturning of vehicles on a curve can be avoided by using ............

When a chain line encounters a river ............