ページの作成:「<br>Serration is a noticed-like look or a row of sharp or tooth-like projections. A serrated leading edge has many small factors of contact with the material being reduce…」
(ページの作成:「<br>Serration is a noticed-like look or a row of sharp or tooth-like projections. A serrated leading edge has many small factors of contact with the material being reduce…」)