Briefly introduces the lighting requirement of car headlamp,narrates the surveying method of the upper beam,lower beam and group lamp′s character,also the train thought of confirming and how to make the light and shade closing line.
简述汽车前照灯的照明要求 ,叙述了对远光、近光以及灯具组照明特性的测量方法 ,说明等照度曲线、明暗截止线的判识和制取的思路。
Most modern metallurgical microscopes adopted the so-called“infinity optical system”design, in addition, plano-achromatic objectives, wide-field eyepieces, and high magnification dry objectives are widely used.
现代金相显微镜已普遍采用无限远光学系统设计,并广泛使用平场消色差物镜、广视场目镜、高倍干物镜;一般均装备有明视场、暗视场、偏振光、DIC等常用的照明方式。