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在塑料和铝及其它软材料的零件装配中,应用附图所示小螺钉,可以不经过攻丝便能直接在底孔上装配,并且在装配中也不会出现滑
In plastic and aluminum and other soft material parts assembly, the use of screws shown in the drawings, can be tapped directly in the bottom hole assembly, and will not appear in the assembly slip