Electrician and Wireman Power Systems Earthing

ପୃଥିବୀ ତାର ____________ରେ ନିର୍ମିତ:

1
ତମ୍ବା
2
ଆଲୁମିନିୟମ 
3
ଲୁହା 
4
ଦସ୍ତାଲେପିତ ଇସ୍ପାତ

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