The empoison of this courseware changed the situation of the traditional teaching model in which the teacher draw the picture on the blackboard and it is so difficult to image the three - dimension space that the students ca n ' t understand the relevant knowledge in space analytic geometry 本课件的开发改变了传统教学中，学生空间想象力差难以接受相关知识以及教师在黑板上画图，难以建立空间概念等困难的现状。
2.
Now , energy souces consume increasing daily and environment empoison being serious gradually , wind power , as renewable , no pollution energy source , is paid great attention by more and more countries . the technology also become research hotspot of many country ' s scholar 在能源消耗日益增长、环境污染日渐严重的今天，作为可再生绿色能源的风能成为世界各国普遍重视的能源，风力发电技术也成为各国学者竞相研究的热点。
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Now , energy sources consume increasing daily and environment empoison being serious gradually , forced people to consider new and renewable energy development and utilization , wind power is paid great attention by more and more countries because of its outstanding excellence in them 在能源消耗日益增长、环境污染日渐严重的今天,迫使人们考虑新能源和可再生能源的开发和利用问题。其中风能由于其突出的优点而成为世界各国普遍重视的能源,风力发电技术也成为各国学者竞相研究的热点。
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Due to slope cable bears barely alternative load longtime in nature environment , it is easy to corrosion and wreck . seriously , the bridge is possibility to collapse in strictness air empoison , water pollution , seashore and ocean surroundings . therefore , to study cable ’ s corrosion widely and to inhibit corrosion process are very important for increase endurance and safety of bridge construction 由于斜拉索长期承受交变载荷并暴露于自然环境中,特别是大气污染严重地区、水污染严重地区、海滨及海洋环境,极易发生腐蚀破坏,严重者还会因坍塌而造成生命及财产的巨大损失,因此,全面研究桥梁拉索的腐蚀,阻断腐蚀的成因,对提高桥梁结构的耐久性与安全性具有重要意义。
