【多选题】CATV is a short way of saying “community antenna( 天线 ) television.” But “cable television” is the term most people use. Cable television allows 46 to receive TV programs that they cannot pick up with ...
【单选题】In neuronal signaling, the chemical messenger is a neurotransmitter (acetylcholine, for example). Electrical signals (nerve impulses) originate in the cell body of a neuron and travel very rapidly ove...
【单选题】A 56Kbps Modem is a divice that translates the ( )aignals from your computer into analog signals that can travel over a standard phone line, and it can sends data at 56,000 bits per second.