以下为句子列表：
英文: Abstract: Requirements for hydraulic steering rack cylinder are very high, the rack cylinder should be durable, lubricants preservable and of seal. so, finish machining and parameter-set are necessary.
中文: 文摘:液压转向机对齿条杆部表面有很高的耐磨、储油、封存要求，为此需要一套表面超精加工工艺及加工参数设定。
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