| 摘要 |
For an inner surface of a hole having a first region (3a) on which a spray coating film (11) is formed and second regions (3b, 3c, 3d) that are continuous with the first region (3a) but do not require formation of the spray coating film (11), a rough surface is formed in the first region (3a) and locations where rough surfaces are formed in the second regions (3b, 3c, 3d) are also provided before the formation of the spray coating film (11). |
