What is defined as a local corrosion damaged characterized by surface
cavities.
The following statements are true except one which one.
What is a process of producing a hard surface in a steel having a
sufficiently high carbon content to respond to hardening by a rapid cooling of
the surface?
The substance added to the soil to provide one or more nutrient
elements essential for plants growth are called.
Which one of the following set of raw material is most suitable for
manufacture of urea.