A. Right angle to the centre line
B. 30 metres apart
C. Intermediate points having abrupt change in gradient
D. All the above
Correct Answer: All the above ✔
Last Updated: January 20, 2019
A. Right angle to the centre line
B. 30 metres apart
C. Intermediate points having abrupt change in gradient
D. All the above
Correct Answer: All the above ✔
Last Updated: January 20, 2019