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天堂里的安全通行证
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作者 李坚 谢鲁渤 《人民公安》 2004年第7期50-52,共3页
关键词 安全通行证 刑事技术 犯罪嫌疑 刑侦工作 抢劫杀人案 刑侦技术 杭州 紫外观察照相系统 大队长 犯罪心理
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旧闻新知
2
作者 方陵生 《大学英语》 2002年第10期6-7,共2页
关键词 安全通行证 大学英语 法老时代 古代埃及 亨利五世 中国文化 多伦多大学 星期五 非基督教 人类学
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A new type of facility to assist ship safely though the Rapids Rubber Dam
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作者 XlA Demin 《International English Education Research》 2016年第4期79-81,共3页
Rapids and shoals in the channel have a huge impact on the safety of the ship navigation, Based on the principle of a rubber dam can always adjust the height of the dam and raise upstream water level, This thesis crea... Rapids and shoals in the channel have a huge impact on the safety of the ship navigation, Based on the principle of a rubber dam can always adjust the height of the dam and raise upstream water level, This thesis creatively proposed the principle which applied to rapids and shoals in the Channel. In order to achieve the purpose of assisting ship through the channel safely. In this paper, through theoretical calculations verified the rubber dam has characteristics of raising water level, increasing the depth of the shoals, reducing the flow velocity, reducing water surface slope and improving the conditions of navigation. Therefore, this study has a wide range of practical value and application prospects in the project 展开更多
关键词 Rubber dam Rapids and shoals Raise water level Flow velocity Water surface slope Navigation condition
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