It is prerequisite to measure the three-dimensional braided composite materials preform s technical parameters in the process of its design and production.
在三维编织复合材料预制件的研制和生产过程中，需要测量和分析材料的工艺参数。
参考来源 - 碳纤维三维编织复合材料预制件厚度的测量The composites were observed by light microscope. The combination quality of matrix between composite layers is deteriorated when density of preform is increased.
通过光学显微镜对复合材料组织进行研究,发现随着Ti-C体系预制块致密度的提高(50%～65%),复合材料中过渡层质量下降。
参考来源 - VThe proposed FEM preform optimization method is very effective and overcomes abuse of experience design.
所提出的有限元模拟预成形优化方法十分有效,克服了以往凭经验设计的弊端。
参考来源 - 基于刚粘塑性有限元模拟的汽轮机叶轮模锻的预成形优化And Erbium-doped fiber preform is fabricated using this method.
并利用这种方法实际制作了掺铒光纤预制棒。
参考来源 - 掺铒光纤的制备工艺及其特性研究It is prerequisite to measure the three-dimensional braided composite materials preform s technical parameters in the process of its design and production.
在三维编织复合材料预制件的研制和生产过程中，需要测量和分析材料的工艺参数。
参考来源 - 碳纤维三维编织复合材料预制件厚度的测量However, there are still many difficulties in mass production of qualified preform of paper-based friction material using manual sheet-making apparatus. So a semiautomatic sheet-making apparatus was designed to make an improvement.
借鉴于造纸工艺的碳纤维增强纸基摩擦材料预制体成型工艺——“抄片”，成为保证预制体增强纤维、摩擦性能调节剂和填料在预制体中均匀分布的重要一环。
参考来源 - 基于气动机械手实现纸基摩擦材料自动抄片技术基础研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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A study on teaching reform of Affiliated School of Competitive Sports of Wuhan Institute of P. e.
武汉体育学院附属竞技体校教学改革研究。
How to display better the role of P. E. teaching in the quality education remains an urgent problem in deepening the teaching reform.
如何在新形势下更好地发挥体育教学在素质教育中的作用。是目前深化教学改革的一个迫切问题。
The reform of curriculum of physical and healthy education in middle school puts forward new and high challenge to the P. E. teachers in 21s t century.
中学体育与健康课程对21世纪中学体育教师提出了新的挑战和要求。
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