In the time domain， the procedure of restoring the original continuous-time signal from discrete sample values is called_______

Unceasing, continuous, it cannot be defined, and r______(return) again to the realm of nothingness. (time: 8:34)

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

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

One reversible continuous-time LTI system is cascaded with its reverse system, then the whole continuous-time system is one ( ) system A:

The following statements about the sampling is incorrect. （ ） A: Sampling is a bridge between continuous-time signals and discrete-time signals. B: Sampling is a bridge between continuous-time system and discrete-time system. C: Sampling is a bridge between discrete-time signals and discrete-time system. D: Sampling is a bridge between the various analytical tools of the continuous-time version and discrete-time version.

Which of these is NOT a tense? ( ) A: The present continuous B: The past perfect C: The future perfect continuous D: The passive

稽留热（continuous fever）

连续培养(continuous culture )

Analog signal is continuous