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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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。

youdao