With reference to our recent exchange of E-mails lately, we confirm our order as follows.

根据我们近来交往的电子邮件，兹确认以下订单。

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This paper puts forward a new MRACS method using low order model, i. e. the fourth order hydraulic servo system following the first order reference model.

本文把液压伺服系统作四阶系统，跟随一阶参考模型，提出了一种新的高阶对象和低阶模型的MRACS 的方法。

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