The electrical resistance of stainless steels can be
as much as______ time that of carbon steel.
What refer to the casehardening process by which the carbon content of
the steel ear the surface of a part is increased?
Ammonia when used directly as a fertilizer is to be injected about_____
under the surface to keep it from seeping out.
Which of the following potassium fertilizers are more useful for
horticultural crops tobacco and potatatoes.
Which one of the following set of raw material is most suitable for
manufacture of urea.
Which of the following is NOT a hardware requirement
for die casting.
The percentage of nitrogen in ammonia is _______________%
