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Question
Refractoriness under load (RUL) is the most important property for the refractory bricks
Options:
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: Option A
Answer: (a).at the hearth bottom of the furnace on which stock is placed.

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