critical cutting angle临界切削角
critical emitting angle临界发射仰角
critical shear angle临界剪切角
critical stable angle临界稳定角
critical helical angle临界螺旋角
critical divergent angle临界扩散角
critical slope angle最大安全斜坡角度;临界坡角
critical clearing angle临界消灭角度
critical contact angle临界接触角
N（名词） the smallest possible angle of incidence for which light rays are totally reflected at an interface between substances of different refractive index 临界角