大家排了那么长的队伍,就是为了等我的正确答案吗,哈哈。 9 C# b+ Q7 ~9 t1 h* n + y/ g. v- b4 s% K5 `8 d% d/ rToothed Blades: Toothed blades are useful (before using the regular blade) when working extremely difficult woods, because they score fibers in a criss-cross pattern. They are also used to prepare surfaces for gluing, as in veneering, by lightly roughening the surface.