The paper introduces the application of CCTV in freeway, especially introduces the structure, selection of equipment, transmission mode of the CCTV system in tunnels.是什么意思_The paper introduces the application of CCTV in freeway, especially introduces the structure, selection of equipment, transmission mode of the CCTV system in tunnels.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句