| 摘要 |
<p>In the present invention, water that has intruded from an aperture (6a), which is open at a position that is off from a projection plane of a substrate (8) on a sheet-metal top surface (6), flows across the inside of the sheet-metal top surface (6) so as to drop down at a first convex portion (6b), flows from an inclined surface (7a) to a second convex portion (7b), and is guided, by the second convex portion (7b), to a direction that avoids the substrate (8).</p> |
