Pick out the wrong statement ?

A. Graphite and metals are the good electrical conductor among the refractories and others are all

B. naces</strong>

C. Electrical conductivity of refractory is not important, when these are to be used in electrical

D. ductivity

E. Refractories used for lining electrical furnaces should ordinarily have very low electrical

F. Electrical conductivity of porous refractory material is low

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