Preserved method : Avoids putting in the high temperature, moist and sunlight perpendicular incidence place, seal preservation.
保存方法: 避免置于高温, 潮湿及日光直射处, 密封保存.
The angle drawn at the point of incidence ( intersection of) a reflected ray and the normal line perpendicular to the reflecting surface.
中义光线在物体表面的投射点上反射出来的光线与物体表面垂直法线所夹的角度。
the angle between a reflected ray and a line perpendicular to the reflecting surface at the point of incidence.
在一个入射点一条反射线与垂直于表面的线之间的夹角。
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