怎样正确理解真子集概念及真子集关系的传递性

A、B、C是集合。“A包含于B”表示集合爿是集合B的真子集，而“A包含B”表示集合A是集合B的子集；这两种关系有本质上的差异：要说明“A包含B”只须说明任意x∈A，有x∈B：但要说明“A包含于B”除须说明任意x∈A，有x∈B外，还须说明存在y∈B，使得y不属于A。     

网络学习平台中实时交流系统的设计与实现

因信息化时代的发展趋向,网络学习平台已成为一大趋势,是课堂教学之外的有益补充,有助于形成师生双向互动的新型教学模式.本文阐述在网络学习平台中设置实时交流系统的作用,介绍了其功能设计和页面逻辑结构,对如何应用Asp.Net实现其主要功能模块进行了讨论.     

加工中心的刀具选择和使用

加工中心价格昂贵，使用成本高，为了提高加工中心的工作效率。其刀具既要精度高、刚性好、装夹调整方便，又要切削性能强、耐用度高。本文结合实际加工从应用角度提出了加工中心刀具的选择和使用应该遵循的一些原则。     

The Evolution of GIS Services within North American Academic Libraries: Documenting Change through the Decades (1995–2016)

This review was conducted to identify articles written about Geographic Information Systems (GIS) services offered in the United States (US) and Canadian university and college libraries. In the early 1990's, the Association of Research Libraries (ARL) GIS Literacy Project, in partnership with Environmental Systems Research Institute (ESRI), helped enable ARL member libraries to create GIS services within their libraries. By the mid to late 1990's, librarians from academic institutions began to write articles that discussed how their library developed GIS services and the components involved with operating a GIS service. Writing about GIS services in academic libraries continued on into the 2000's and 2010's. This review of the literature will document the areas of staffing, service, technology, and data provision for GIS service units from three decades (1990's, 2000's, and 2010's).     

VB.NET中的异常处理技术研究

探讨VB6．0中采用On Error、Resume、Err对象等进行错误处理的技术以及VB．NET中采用Try… Catch… Finally语句块、Exception对象、创建自定义Exception类等进行异常处理的技术，对结构化和非结构化异常处理机制和技术进行比较，并对采用VB．NET语言开发应用软件时如何使用异常处理技术进行举例说明。     

Canine Visitors: The Influence of Therapy Dogs on Young Children's Learning and Well-Being in Classrooms and Hospitals

Trained therapy dogs are becoming an increasingly common sight in many educational and health care settings. This article, coauthored by a college professor, a Therapy Dogs International, Inc., Evaluator and local program director, and a registered nurse reviews the research on using registered therapy dogs as adjuncts in school programs and health care treatment plans for children ages 5–8. It addresses to the most commonly raised objections to allowing dogs in classrooms and patient rooms and offers practical guidelines for maximizing the positive outcomes of animal-assisted activities and therapy (AAA/T).     

发掘名人文化促进台州旅游经济发展

台州历史文化积淀比较丰富的有天台山宗教和戴复古诗学文化。对戴复古的研究还有待进一步深入。台州南边旅游景点总体缺少一些文化味，今后可以把戴复古作为台州旅游经济建设的重点品牌来开发。建议：1、科学规划，开展历史名人文化的宣传、保护和利用。2、一体化开发，建设名人品牌景点。3、多渠道筹资建设。4、传承一批民间文艺样式。     

高职院校素质教育培养方案研究

在发展完善高等职业教育的过程中,应突出技能型应用型人才培养与素质教育有机融合这一特色.文章通过对人才素质要求的解析,运用现代分析技术和手段,对高职院校素质教育的主要内容进行了概括,制定了相应的培养和实施方案.     

从太阳崇拜看古代中国与希腊的文明演化差异

古代中国和古希腊的太阳崇拜在经历了图腾崇拜和神灵崇拜阶段后，分别向祖先素拜和宗教崇拜演变，自然地域条件、生产力水平的差异是造成这两种文明中太阳崇拜不同走向的主要原因。