restricted-radiation frequency

As one kind of finite nature resource being shared by human, radio frequency spectrum have the three-dimensional characteristic of the extensity, timeliness and frequency, but it is not be restricted with terrain, airspace and time.

无线电频谱作为一种人类共享的有限自然资源，具有空间、时间和频率的三维特性，又不受地域、空域、时域的限制。

Because characteristic of electron gun job is restricted, scanning frequency included frequency and frequency two concepts.

由于电子枪工作特点限制, 扫描频率包括了行频与场频两个概念.

The intensity of palaeomagnetic field, the proportion and frequency of palaeomagnetic polarity reversal, and the rate of true polar wandering may display the periodic changes in the geological history and are closely related to the opening and closing, and may be restricted to the global factors.

古地磁场强度、古地磁场极性倒转比例、古地磁场极性倒转频率和真极移速率在地史上均呈周期变化，与开合构造关系密切，同受全球性因素制约。

The uses of thermosetting resin have problems of low toughness, short corona resistant time, lower breakdown strength filed on adhesive and impregnating varnish aspect. This restricted its use on high voltage electromotor and frequency conversion system.

目前热固性树脂在绝缘粘合剂和浸渍漆方面的应用存在着韧性低、耐电晕时间短、击穿场强低等问题，这就限制了其在高压电动机及变频调速系统绝缘中的广泛应用。

With this restricted frequency range it is not applicable to hydrocarbons.

这个较紧缩的频率范围不适用于烃类.