基本解释[机械工程]精制螺帽词组短语短语half -bright nut 半精致螺母;半精制螺帽semi -bright nut 半光制螺母semi bright nut 半光制螺母half bright nut 半精制螺帽Bright Mild Steel Hexagonal Nut 光亮软钢六角螺丝帽专业释义机械工程精制螺帽