Modern refers to radio communication: radio communication is a communication method that modulates the electrical signals such as voice, characters, data and images that need to be transmitted on radio waves, and transmits them to the other party through space and ground, and transmits information in space by using wireless electromagnetic waves.
The communication mode that uses radio waves to transmit information is called radio communication, which can transmit sound, characters, data and images. Compared with wired communication, it does not need to erect transmission lines, is not limited by communication distance, has good maneuverability and is established quickly; However, the transmission quality is unstable, the signal is easily interfered or intercepted, easily influenced by natural factors and has poor confidentiality.
Extended data
Couplets, one of the traditional cultures in China, also called couplets or couplets, are antithetical sentences written on paper, cloth or engraved on bamboo, wood and columns. The antithesis of couplets is neat and even, which is a unique artistic form of Chinese language. Couplets are the treasures of China traditional culture.
Couplets, also known as antithesis, antithesis, spring stickers, Spring Festival couplets, couplets, Taofu and couplets (named after the pillars hanging in halls and houses in ancient times), are a kind of dual literature, which originated from Taofu. It is a antithetical sentence written on paper, cloth or engraved on bamboo, wood and columns. It is a unique art form of Chinese, concise and profound, neat and even, with the same number of words and the same structure.
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