An improved Kjeldahl equipment which focusing on the spherical condenser, ventilation switches and the ball for nitrogen had been designed.
针对传统凯氏定氮装置存在的问题，设计了一种新型的定氮装置，尤其对氮气球、通气开关、球型冷凝管进行了重新设计。
The invention provides a method for manufacturing a full spectrum wide-angle condenser based on a nanometer structure. Firstly, a condenser with moderate focusing multiple is designed and processed;
本发明提供一种基于纳米结构的全光谱广角聚光器的制作方法，首先设计加工适度聚焦倍数的聚光器；
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