railway RRB JE (CBT I + CBT II) Mock Test 2024 Fitter Machining Grinding

ગ્રાઈન્ડિંગ વ્હીલમાં, શ્રેષ્ઠ ઘર્ષક કણનું કદ શું છે?

1
6 - 24
2
220 - 1000
3
70 - 200
4
30 - 60 
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