what is a digital signal? () A: discrete signals B: continuous signals C: both of a and b D: signals exist in the world

4. What are the advantages of digital signals, comparedwith analog signals?

Modem is only used to convert digital signals into analog signals and transmit them on the line.

analog signals

Analog signals are characterized by continuous electrical signals in both time and value. A: Correct B: Wrong

which address signals are used to generate the chip select signal of the memory chip for the one-to-one mapping of the memory chip to the logical storage space of the computer system? A: some of the high-order address signals of the address bus B: the lower-order address signals of the address bus C: all remaining high-order address signals of the address bus D: One of the remaining high-order address signals of the address bus

Modem is only used to convert digital signals into analog signals and transmit them on the line. A: 正确 B: 错误

The module responsible for converting analog signals to digital signals is called________. A: BME280 B: CCS811 C: MQ-5 D: ADC

Interpersonal communication is about reading the signals we send each other and recognizing what signals we are sending out。（ ）

Lightning bugs can blink themselves because of a chemical substance According to the passage, which of the following about lightning bugs is INCORRECT A: They use blinking signals to communicate. B: They use blinking signals to seek for food. C: They use blinking signals to attract their own species. D: They use blinking signals to frighten and warn enemies.