排序方式: 共有60条查询结果,搜索用时 15 毫秒
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姚勤 《泰州职业技术学院学报》2004,4(3):53-54,57
目的探讨前牙根折至龈下铸造冠桩修复的体会。方法经钛合金或金合金铸造核烤瓷冠修复。结论牙槽嵴以下的前牙残根在具备一定的修复条件时,经钛合金或金合金铸造核烤瓷冠修复,成功率为96%。 相似文献
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澄清了静电磁学中关于超距作用的某些观点,确认在静电磁相互作用场合不必引入场。指出牛顿第三定律的通常公式表示有不足之处,该定律与超距作用也有差别,提出了"刚体的相互作用定律",并据此分析了两电偶极子和两通电线圈情形时的相互作用。 相似文献
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常温厌氧消化称为常温发酵.通过厌氧消化可有效地改环境,杀灭病原体和虫卵,有效地控制经由粪便传播的疾病. 相似文献
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电、磁、超声复合场在景观水处理方面的应用研究 总被引:1,自引:0,他引:1
阐述了景观水污染特点及危害,介绍电、磁、超声复合场在景观水处理方面的实验研究,研究结果表明其能有效地杀菌灭藻,是一种新型的景观水处理方法. 相似文献
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周坤乔 《湖州师范学院学报》2004,26(1):108-110
在统计软件测试或软件维护过程中,利用抽样调查方法,通过数学模型,对软件可靠性的重要指标残留错误总数进行测定,从而认为软件质量是可以定量计算的,这有助于软件人员进行改进软件质量的工作。 相似文献
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Historical Experiments in Students’ Hands:
Unfragmenting Science through Action and
History 总被引:2,自引:1,他引:2
Elizabeth Mary Cavicchi 《Science & Education》2008,17(7):717-749
Two students, meeting together with a teacher, redid historical experiments. Unlike conventional instruction where science
topics and practices often fragment, they experienced interrelatedness among phenomena, participants’ actions, and history.
This study narrates actions that fostered an interrelated view. One action involved opening up historical telephones to examine
interior circuitry. Another made sound visible in a transparent air column filled with Styrofoam bits and through Lissajous
figures produced by reflecting light off orthogonal nineteenth century tuning forks crafted by Koenig and Kohl. Another involved
orienting magnetic compasses to reveal the magnetism of conducting wires, historically investigated by Oersted and Schweigger.
Replicating Homberg’s triboluminescent compound elicited students’ reflective awareness of history. These actions bore pedagogical
value in recovering some of the interrelatedness inherent in the history and reintroducing the wonder of science phenomena
to students today. 相似文献