(A) V2O5
(B) V2O5 and Pt
(C) Fe
(D) Pieces of Fe crystals are embedded in fused mixture of MgO Al2O3 and SiO2
(A) V2O5
(B) V2O5 and Pt
(C) Fe
(D) Pieces of Fe crystals are embedded in fused mixture of MgO Al2O3 and SiO2
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