Radian Path街道地址
mechanical radian机械角
centi radian厘弧
physiologic radian生理弧度
Radian Protractor弧度制量角器
electrical radian电弧度
radian plasticity弧度塑形性
radian precision对弧精度
N（名词） an SI unit of plane angle; the angle between two radii of a circle that cut off on the circumference an arc equal in length to the radius. 1 radian is equivalent to 57.296 degrees and π/2 radians equals a right angle 弧度 ( symbol: rad)