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Question
Pick out the wrong statement ?
Options:
A .  Electrical conductivity of refractory is not important, when these are to be used in electrical furnaces
B .  Graphite and metals are the good electrical conductor among the refractories and others are all electrical insulators
C .  Refractories used for lining electrical furnaces should ordinarily have very low electrical conductivity
D .  Electrical conductivity of porous refractory material is low
Answer: Option A
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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