What is the angle of intersection of a contour and a ridge line?
A0°
B90°
C180°
D270°
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Related Questions:
Length of a revenue chain is:
Closed contours of decreasing values towards their center represent:
Cumulative errors are proportional to:
The value of deflection angle is:
(a)10
(c) 15
The error which occurs when image formed by objective is not in the same plane with cross hairs of the telescope is: