head free flat joint bar的意思|示意

轨腹上圆弧接触夹板 轨头地面接触夹板;锲型接头夹板head contact flat joint bar 轨腹上圆弧接触夹板;铰型接头夹板head free flat joint bar 带裙鱼尾板aproned fish plate;fish plate with apron ..

铰型接头夹板 轨头地面接触夹板;锲型接头夹板head contact flat joint bar 轨腹上圆弧接触夹板;铰型接头夹板head free flat joint bar 带裙鱼尾板aproned fish plate;fish plate with apron ..