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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