- 28-12-0 繪圖步驟
- 28-12-1 底座
- 28-12-2 鳩尾槽
- 28-12-3 柱孔
- 28-12-4 背板
- 28-12-5 圓柱+刪除面
- 28-12-6 肋材特徵
- 28-12-7 肋圓角
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