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提供備轉容量：依據電網供需的變化來增加增外的供電。當備轉容量不足時，會在數分鐘到小時內，供應一定的電力並維持一段時間（半小時到數小時）。Your browser isn’t supported anymore. Update it to have the most effective YouTube encounter and our most recent features. Learn more眾多用�