Correct answer
B. interlocking points and signal
Explanation
The correct answer is interlocking points and signal.
The diameter of longitudinal bars of a column should never be less than________?
The working conditions in imhoff tanks are________?
Direct method of contouring is________?
The length of a chain is measured from________?
One end of an elastic string of natural length / and modulus X is kept fixed while to the other end is attached a particle of mass m which is hanging freely under gravity. The particle is pulled down vertically through a distance x, held at rest and then released. The motion is________?
Sewer pipes need be checked for________?