The electrical resistance of stainless steels can be
as much as______ time that of carbon steel.
_________ is preferred for horticultural crops and for tobacco and
potatoes.
The brown colour of the pulp obtained from chemical pulping is due to
the present of
Iron is said to be abundant in nature. About how many percent of the
earth’s crust is iron.
Which of the following potassium fertilizers are more useful for
horticultural crops tobacco and potatatoes.
The cooling of molten urea by air in the tower is called.