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fractographic analysis
断口分析
用肉眼或借助于光学显微镜和电子显微镜观察材料断裂表面的特征,确定断裂性质,分析断裂原因,研究断裂机理,为改进材料提出依据的分析方法。
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National Oceanic and Atmospheric Administration
National Oceanic and Atmospheric Administration(US)
National Oceanic Resource Management Authority
National Oceanic Survey
National Oceanography Centre
National Office for Planning of Arts and Sciences
national office for promoting the rise of central China
National office of Water Conservation
National Olympic Committees,NOC
National Olympic Sports Centre
National Open University Audio & Visual Press
National Open University Press
National Opera of Chile
National Opera of Ukraine
National Opera School
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national optical font
national or ethnic question for period of democratic revolution in China
National Orienteering Championships
National Outstanding Children's Literature Award
national overall emergency plan of China
National Palace Museum of Korea
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National Park of China
national park of China emblem
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