... 叶片通过频率 blade passing frequency 叶片造型 blade shape construction 叶片展弦比 aspect ratio ...
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C. during the construction of the shape change, so need to drilling, cutting, general sharp blade, such as empty plate wallpaper knife can cut sunlight plate;
施工中造型的变化，故需要钻孔，切割，空板一般锋利的刀片如墙纸刀就可以切割阳光板；
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