以下为句子列表：
英文: It throughly solved some long time complicated questions such as high service rate in DC motor, large quantities of maintaining contact type drive controller, high energy consumption of DC locomotive.
中文: 彻底解决了直流电机维修率高、换向火花及接触组火花大、触头式司控器维修量大、直流电机车能耗高等老大难问题。
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