railway RRB JE (CBT I + CBT II) Mock Test 2024 Fitter Machining Lapping and Honning

କେଉଁ ଅପଘର୍ଷକ  ନରମ ଲୌହ ଏବଂ ଅଣ-ଲୌହ  ଧାତୁ ପାଇଁ ବ୍ୟବହୃତ ହୁଏ?

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ତମ୍ବା ଅକ୍ସାଇଡ୍
2
ପାଉଁଶ ଉଡନ୍ତୁ
3
ସୋଡିୟମ୍ କ୍ଲୋରାଇଡ୍
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ଆଲୁମିନିୟମ୍ ଅକ୍ସାଇଡ୍
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