【单选题】薄板群钻的形状特点是,主切削刃磨成圆弧形,钻尖高度磨低,切削刃外缘磨成锋利的两个刀尖,与钻心尖相差(),形成三尖。
【单选题】Whether this will be your first or your thousandth business trip, you should be conscious of conduct that is considered proper during your absence from the office. As a representative of your company,...
【判断题】薄板群钻的特点是:两切削刃外缘磨成锋利的刀尖,比钻心尖在高度上高出0.5-1.5mm。能起到良好的 定心作用,并能提高孔的圆整度和降低粗糙度值。