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岳文静 《课堂内外(高中版)》2008,(10)
日子就像一个巨大的汉堡。白天和黑夜是两块不断延伸的面饼,牢牢地锁住了庸庸碌碌的苍生。挤。空气仿佛即将溢出的油腻而酸涩的沙拉。我觉得自己是一种霉菌,试图在已逝或将逝的日子里留下些什么…… 相似文献
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从命题本身因素入手,针对命题类型对条件推理的影响设计了两个实验,分别从整体和前后件语义关系上探讨命题类型对条件推理的影响.结果发现：条件推理中存在明显整体正确内容促进效应;从前后件关系的语义表征上理解命题,条件命题成绩最好且与反条件命题、双向条件命题、非条件命题均存在显著差异;正确命题中表现出从整体理解命题对条件推理影响的优势. 相似文献
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专业大类阅览室是以学院专业大类设置为依据,重新规划、配置和整合图书馆的空间、资源和服务而建成的新型阅览室。高职类职业技术学院专业大类阅览室建设实践,分析了其专业大类服务平台、课程教学服务平台、一站式多元服务平台的功能定位,探讨了转变理念、共享空间、整合资源、提升服务的建设策略。 相似文献
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A cognitive relay network model is proposed, which is defined by a source, a destination, a cognitive relay node and a primary user. The source is assisted by the cognitive relay node which is allowed to coexist with the primary user by imposing severe constraints on the transmission power so that the quality of service of the primary user is not degraded by the interference caused by the secondary user. The effect of the cognitive relay node on the proposed cognitive relay network model is studied by evaluating the outage probability under interference power constraints for different fading environments. A relay transmission scheme, namely, decode-and-forward is considered. For both the peak and average interference power constraints, the closed-form outage expressions are derived over different channel fading models. Finally, the analytical outage probability expressions are validated through simulations. The results indicate that the proposed model has better outage probability than direct transmission. It is also found that the outage probability decreases with the increase of interference power constraints. Meanwhile, the outage probability under the average interference power constraint is much less than that under the peak interference power constraint when the average interference power constraint is equal to the peak interference power constraint. 相似文献
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