Discussion
Assertion: a refractory that resists fusion to 1700 degrees can safely line a furnace at 1600 degrees. Reason: its refractoriness exceeds the working temperature.
Answer: B
Refractoriness alone is not enough: the brick carries load while hot, and its refractoriness under load may be hundreds of degrees lower. Slag resistance and spalling behaviour must also be checked before it is specified.
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