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| torsion test of metallic wire (【技】将试样两端夹紧，一端夹头围绕试样轴线旋转，检验金属线材在单向或交变方向扭转时承受塑性变形的能力并显示材料的均匀性、表面和内部缺陷的试验。) | |||
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