A. Should be sunk by 20 cm
B. Should be kept 20 cm above the adjacent portion
C. Should be sunk by 50 cm
D. Need not be sunk
Correct Answer: Should be sunk by 50 cm ✔
Last Updated: August 25, 2020
A. Should be sunk by 20 cm
B. Should be kept 20 cm above the adjacent portion
C. Should be sunk by 50 cm
D. Need not be sunk
Correct Answer: Should be sunk by 50 cm ✔
Last Updated: August 25, 2020