| micr. |
无线 (A part of a device that converts sound waves or mechanical movements into corresponding electric waves or impulses); 调频广播 (A part of a device that converts sound waves or mechanical movements into corresponding electric waves or impulses); 无线电 (Electromagnetic waves longer than about 0.3 mm (frequencies lower than about 1 THz). Radio is used to transmit a wide variety of signals, using various frequency ranges and types of modulation, such as AM and FM broadcasts, microwave relays, and television broadcasts); 收音机 (Electromagnetic waves longer than about 0.3 mm (frequencies lower than about 1 THz). Radio is used to transmit a wide variety of signals, using various frequency ranges and types of modulation, such as AM and FM broadcasts, microwave relays, and television broadcasts) |
