使用菜瓜布刷洗管件之鋁面，鋁面以順時針方式刷洗(圖二十一)，刷洗紋路需

使用菜瓜布刷洗管件之鋁面，鋁面以順時針方式刷洗(圖二十一)，刷洗紋路需一致。

結果 (英文) 1:

Use the melon cloth to brush the aluminum surface of the pipe fittings. The aluminum surface is brushed clockwise (Figure 21).

結果 (英文) 2:

Brush the aluminum surface of the tube with a vegetable melon cloth, the aluminum surface is brushed clockwise (Figure 21), and the brush pattern should be consistent.

結果 (英文) 3:

Brush the aluminum surface of the pipe fittings with papaya cloth, and brush the aluminum surface in a clockwise manner (Figure 21), with the same lines.