R50 = R20×[1 + α1(T2 - T1)]
=100×[1 + 0.00393(50-20)]
=111.8 Ω
48.—架空用硬抽銅絞線,規格為7/4.0 mm 500 km,電阻的溫度係數為..-阿摩線上測驗