(A) ग्रेफाइट (C)
(B) क्वार्ट्ज ग्लास (SiO2)
(C) क्रोम एलम
(D) सिलिकॉन कार्बाइड (SiC)
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Ans:- (B) क्वार्ट्ज ग्लास (SiO2)