... 螺旋测微计 screw micrometer 螺旋测微镜 screw microscope 螺旋对称性 helical symmetry ...
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Fracture analysis of screw fastener was carried out by means of metallography and scanning electron microscope.
采用光学显微镜、扫描电镜等测试手段,对断裂紧固螺钉进行了分析。
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