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firstly
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第一,首先
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详细解释：
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以下为句子列表：
英文: Abstract: Based on the analysis of the physical structure,operati ng principle and dynamic characteristics of the power unit of an excitation cont rol system,a model of this power unit is firstly established with bond graph app roach.The operation of this
中文: 文摘:在对同步发电机自并励系统功率单元的物理结构、工作原理及动态特性进行分析的基础上，建立了励磁功率单元分布式物理图网模型，并在MATLAB的Simulink平台上对励磁功率单元正常和几种故障情况下的工作进行了仿真研究，并与实际工作情况进行了比较.
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英文: Abstract: On the basis of research on objective system of safety management by objectives and research of the making,developing and dividing of the management objectives.The method of choosing objectives which are used to check and analyse is firstly stud
中文: 文摘:在安全目标管理目标体系及目标制定、展开与分解研究的基础之上，论述了选择检查分析目标的方法，讨论了检查分析目标的内容，最后给出了某煤矿安全目标管理的实施及控制的应用实例。
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英文: Abstract: The structure and operating principle of triangulation probe are firstly briefly introduced in the paper.The analysis and derivation for the reflection property of metal surface are carried out.Several existed problems and solving schemes for me
中文: 文摘:首先简单介绍了三角法测头的结构和工作原理，对金属表面的反射特性进行了分析和推导，提出了三角法测量金属表面时存在的几个问题以及解决方案。
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英文: After firstly comparing with several common methods of report form printing based on B/S, this article expounds the detail of how to colligate many different techniques to realize report form printing, combined with concrete problems encountered in practi
中文: 本文首先比较分析了B/S模式下几种常见的报表打印解决方案,结合在实际开发中遇到的问题,详细阐述了如何综合利用多种方法来解决具体的问题,并给出了相关实现代码。
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英文: After the Lukouchiao Incident (July 7, 1937), Chinese Communist Party firstly proposed the postal services between Kuomintang and Communist areas fur meeting the need of the anti Japanese war, achieving the open postal services of each war zone, and keepi
中文: 摘要1937年，卢沟桥事变爆发后，随着抗日战争局势的变化，为了适应抗日战争形势的需要，使各战区邮政能够互相畅通，在中华邮政协助抗日的前提下，为了更有效地保证国统区与根据地之间的信息畅通，更好地合作抗日，中国共产党首先提出国共两区正式通邮的号召。
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