भारी मशीनों में किसको ल्यू – McqOptions

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1.	भारी मशीनों में किसको ल्यूब्रिकेन्टस के स्वरुप में प्रयुक्त किया जाता है -
A.	ग्रेफाइट
B.	सल्फर
C.	फॉस्फोरस
D.	सिलिका
Answer» B. सल्फर

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