railway RRB JE (CBT I + CBT II) Mock Test 2024 Fitter Lubricants and Coolants

ଏକ କାଷ୍ଟ ଲୁହା ଧାତୁ ଖୋଳିବାବେଳେ ନିମ୍ନଲିଖିତ ଶୀତଳିକରଣ ମଧ୍ୟରୁ କେଉଁଟି ବ୍ୟବହୃତ ହୁଏ?

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କିରୋସିନି
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ଶୁଖିଲା ପବନ
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ଲବ୍ରିକାଣ୍ଟ ତେଲ
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ମେସିନ୍ ତେଲ
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