Chemistry · Polymers and Materials
बिजली के तारों पर एक इन्सुलेटिंग (विद्युतरोधी) सामग्री की परत चढ़ाई जाती है। आमतौर पर इस्तेमाल की जाने वाली सामग्री कौन सी है?
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- 4उपरोक्त सभी
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