Physics · Electrical Engineering
अर्थिंग रॉड (earthing rods) बनाने के लिए किस प्रकार की सामग्री का उपयोग नहीं किया जाता है?
- 1कॉपर बॉन्डेड स्टील
- 2गैल्वनाइज्ड आयरन
- 3स्टेनलेस स्टील
- 4कार्बन बॉन्डेड पॉलीमर✓
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