When the whole circle circle bearing of two lines AB and AC are 115° and 41° respectively, then the included angle BAC will be ............

In measuring horizontal angles, the theodolite should be turned ............

Straight, parallel and widely spaced contours represent ............

The additive constant for the tacheometer is ............

The projection of a traverse line on a line parallel to the meridian is known as ......... of the line.

Sensitiveness of bubble tube can be increased by ............

The reduced bearing of a line is N 87° W. Its whole bearing is ............

A Bench mark is a ............

If the whole circle bearing of a line is 270° its reduced bearing is ............