Physics · Material Science and Cutting Tools
निम्नलिखित में से किस काटने वाले उपकरण (cutting tool) की सामग्री में उच्चतम तप्त कठोरता (hot hardness) होती है?
- 1कास्ट एलॉय (ढलवां मिश्र धातु)
- 2कार्बन टूल स्टील
- 3हाई-स्पीड स्टील
- 4सिरेमिक्स✓
सही उत्तर देखें
सिरेमिक्स
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