four-screw leveling head是什么意思

中文翻译四螺钉安平头

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1)four-screw leveling head,四螺钉安平头2)Screw-flat head,平头螺钉3)brass screw with flat head,平头铜螺钉4)iron screw with flat head,平头铁螺钉5)knurled screw,滚花平头螺钉6)flat mushroom-gbead screw,平顶菌头螺钉

four-screw leveling head是什么意思

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