短語詞組短語king bolt bush head 中柱的大頭bolt square head 方頭螺栓BOlT CYLINDER HEAD 氣缸蓋螺栓bolt hexagon head 圓頭螺栓cup -headed bolt snap head bolt 半圓頭螺栓bolt head recess 彈底槽bolt head surface 螺栓頭表面Bolt -flange head 法蘭頭螺栓 返回 bolt head