railway RRB JE (CBT I + CBT II) Mock Test 2024 Production Engineering (Manufacturing) Machining Processes and Machine Tools Different Machining Processes

निम्नलिखित में से कौन प्राकृतिक अपघर्षक नहीं है?

1
गार्नेट
2
एमरी
3
बोरॉन-कार्बाइड
4
कोरन्डम
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