测试针
This part describes the designing of the needle bearing testing machine, which is used for the bearing wearing test.
其次,进行了襟翼滚针轴承磨损试验机的设计。
industry production testing needle enterprises, selection of carbon tool steel materials, with strong resistance to abrasion;
业生产测试针企业,选用碳工具钢材料,具有耐磨性强;
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