Making transmission projection experimental realia of Ohmmeter is convenient for teaching Ohm-meter measurement principle with the aid of projector.
2
投影仪采用几何设计原理，允许操作员近距离分析材料而不会影响皮料的投影效果。
The projector is of the Geometric Design, which allows the operators to stand by closely but still guaranties the excellent projection effect.
3
本文介绍光导纤维内窥焊弧投影仪的结构和原理，并给出主要参数。
This paper describes the structure and the principle of the projected instrument of optical fibers inspection for the welding arc and gives major parameters.
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