光幕保护 Light curtain protection 门开启和关闭期间，覆盖整个门高度的几十束红外光线探测乘客和物体的门保护住装置。
Multiple infrared light beams covering the full height of the door as the opens or close detect passengers or objects.
用化学选择溶提法，测定了幕阜山不同海拔高度土壤及剖面不同层次的粘粒中铁铝氧化物的含量。
The Contents of iron and aluminum oxides in MUfu mountain soil clays were determined by selective dissolution technique.
首先介绍了光幕测量高度的原理，给出了高度测量光幕的一种实现方法，分析了由该方法设计的系统结构和主要性能。
The principle of measuring light screen is introduced. A design of measuring light screen implemented with C51Microcontroller is proposed. The system structure and main performance are analyzed.
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