以下为句子列表：
英文: By studying the vibration signal characteristics in periodic loading machine system, vibration signal model including state equation and observed equation was constructed.
中文: 通过研究周期性负载机械系统振动信号的特点，构造了包括状态方程和观测方程的振动信号模型。
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英文: QD Type Electromotive Double Girder Crane with Bridge Style is a general loading and unloading machine designed according to GB/T14405-93 Standard.
中文: QD型电动双梁桥式起重机是根据GB/T14405-93标准设计的，是一种通用的起重装卸机械。
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英文: The improving problem of hydraulic pressure change direction system of loading machine was disscussed.The ten tative ideas of utilizing limited pressure change direction system were put forward.
中文: 探讨了装载机液压转向系统的改进问题，提出了采用限压式液压转向系统的设想。
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英文: This paper expounds the hydrostatic transmission technology's application to typical loading/unloading machine and its development trend.
中文: 摘要指出静液压传动的优势，讨论了静液压传动技术在典型装卸搬运机械上的应用，并说明静液压传动技术的发展趋势。
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