निम्न में से कौन सा पेंसिल � – McqOptions

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1.	निम्न में से कौन सा पेंसिल में इस्तेमाल किया जाता है ?
A.	सिलिकन
B.	लकड़ी का कोयला
C.	ग्रेफाइट
D.	फॉस्फोरस
Answer» D. फॉस्फोरस

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