engineering recuitment DRDO Technician A 2022 Mock Test Series (Tier I) Fitter Heat Treatment

इन शीतलन माध्यमों में से कौन सर्वाधिक तीव्र शीतलन प्रदान करता है ?

1
तेल 
2
हवा 
3
लवण जल 
4
पानी 
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