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Test method (friction test): 1. Sampling: Randomly take screw samples. 2. Operation: Drag the threaded part or drill bit of the screw several times on the surface of ordinary paper (such as A4 printing paper or gloves) with appropriate pressure. 3. Judgment: Check the surface of the paper. If there are obvious cuts or deep scratches, they are judged as unqualified; if there are only slight indentations or superficial scratches, they are judged to be qualified.