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FestiveAmbianceBeijing,China论文

Festive Ambiance Beijing, China

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根据《3~110 kV电网继电保护装置运行整定规程》DL/T 584-2007 和《电力系统继电保护与安全自动装置整定计算》可以发现,考虑到保护动作时间、断路器动作时间以及断路器断口熄弧特性相对固定,10 kV配电网线路重合闸时间主要与故障点断电熄弧去游离时间紧密相关。如果在断路器重合前,非永久性故障点已经成功熄弧,重合闸操作即可成功,否则重合闸将失败。

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Large flower decorations have been set up in Beijing to celebrate the 70th anniversary of the founding of the People’s Republic of China on October 1. This decoration, which includes the number “70” and China’s National Emblem, near Jianguomen along the Chang’an Ave., stands out against the background of the blue sky and high buildings.

目前云天化集团主要进口产品为化肥生产原料——硫磺和国际贸易业务的进口大豆等农产品;年进口硫磺约260万吨、大豆贸易400多万吨,年均进口额约6—7亿美元。接到参加中国国际进口博览会的任务后,集团高度重视并迅速开展一系列准备工作。除确定云天化集团、云天化股份、云天化联合商务、瑞丽天平边贸等4家主体单位以及主要负责人参会外,集团还积极落实未来五年采购情况,初步规划年采购意向约10—13亿美元。

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Hu Qingming

本文来源: https://www.lw33.cn/article/a3cafb3d783f3a3eefa76a48.html