General Studies · Cutting Tools
एक मानक ट्विस्ट ड्रिल (twist drill) मुख्य रूप से निम्नलिखित में से किस सामग्री से बनी होती है?
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- 1एल्युमिनियम मिश्र धातु (Aluminium alloy)
- 2मृदु इस्पात (Mild Steel)
- 3तांबा मिश्र धातु (Copper alloy)
- 4हाई स्पीड स्टील (HSS)✓
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हाई स्पीड स्टील (HSS)
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