| 摘要 |
Films (8, 9, 13, 14) with an outer layer of polyfluoroethylene are bonded to both sides of the propeller blades. A boat propeller has a film (8, 9, 13, 14) glued to both sides of each propeller blade (2-4). The outside of the film comprises a smooth, closed layer of polyfluoroethylene. |
