General Studies · Hand Tools
एक इंजीनियर रेती (file tool) की सामान्य वांछनीय कठोरता (hardness) कितनी होती है?
- 185 HRC
- 230 HRC
- 360 HRC✓
- 490 HRC
सही उत्तर देखें
60 HRC
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