_ Refractoriness under load (RUL) is the most important property for the refractory bricks$?

At the hearth bottom of the furnace on which stock is placed

Used in the roof of the furnace

_ Refractoriness under load (RUL) is the most important property for t

1.	_ Refractoriness under load (RUL) is the most important property for the refractory bricks$?
A.	At the hearth bottom of the furnace on which stock is placed
B.	Used for furnace insulation
C.	Used in the roof of the furnace
D.	None of these
Answer» B. Used for furnace insulation