Electrician and Wireman Power Systems Earthing

અર્થ વાયર શેનાથી બને  છે?

1
તાંબા
2
એલ્યુમિનિયમ
3
લોખંડ
4
ગેલ્વેનાઈઝ્ડ સ્ટીલ

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