engineering recuitment DRDO Technician A 2022 Mock Test Series (Tier I) Fitter Lubricants and Coolants

निम्न में से कौनसा एक तरल स्नेहक है?

1
मोलिब्डेनम डाइसल्फाइड
2
ग्रीज़
3
कृत्रिम तेल
4
मोम
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