Frequency Waves,High
《英文msh詞典》Frequency Waves,High
[入口詞] Frequency Waves,High
[主題詞] Radio Waves
[英文釋義] That portion of the electromagnetic spectrum beyond the microwaves,with wavelengths as high as 30 KM. They are used in communications,including television. Short Wave or HF (high frequency),UHF (ultrahigh frequency) and VHF (very high frequency) waves are used in citizen's band communication.