During the near three decades, high - frequency ground wave radar detecting for sea has been regarded for its high performance by many countries.
近三十年来，高频地波对海探测雷达因其本身所特有的优点而引起了许多国家的高度重视。
In the same measuring point, the reduction effect to the noise with high frequency was significant near by the surface.
同一测点，不同高度时，近地面处高频交通噪声减弱效果明显；
The physical mechanism about reflection of low-emission glass in near-infrared region is explained by using plasma cut-off frequency theory.
利用等离子体截止波长理论，解释了低辐射玻璃红外反射的物理机制。
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