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1·The paper discusses on DDS spectrum purity improvement, and gives the circuit scheme.

对如何提高DDS输出频谱纯度进行了探讨，并给出电路解决方案。

2·It has important significance in the design of high purity spectrum agile signal synthesizer and frequency synthesizer in military digital communication equipment.

这对于高纯频率捷变合成信号源和军用数字通信设备中频率合成器的设计具有重要意义。

3·Measurement of Oxygen in High Purity Nitrogen by Means of Air Pressure Ionic Mass Spectrum;

用液相色谱-大气压光离子质谱开发出测定鱼肉中的氯霉素抗生素的方法。