Roof of a basic electric furnace is made of _____________ bricks?
(A) Superduty fireclay
(B) Silica
(C) Chromite
(D) None of these
Roof of a basic electric furnace is made of _____________ bricks?
(A) Superduty fireclay
(B) Silica
(C) Chromite
(D) None of these
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