The double-sided protractor comprises two identical protractors and is structurally characterized in that a rotating shaft is arranged in the center ofthe two overlapped protractors. 本实用新型包括两个相同的量角器,其结构要点是在上下两个叠加量角器的中心上设置有转轴。
Methods: The external noses of 338 adults and 83 adult cadavers were measured with slide callipers, triangles and protractors. 方法:用游标卡尺、三角板、量角器,对338名成人外鼻和83具成人尸体外鼻进行了测量。