rivacitg
@rivacitg
有効 (3年, 10か月前)ジャニラブポイント： 6
Electric cables are normally installed on the assumption of a safe working life
Electric cables are normally installed on the assumption of a safe working life of at least 20 years. Changes in the insulating material take place with the passing of time and these changes, which may eventually result in an electrical breakdown, are […] 表示
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