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

The New York City is called_______ A: the Big Apple B: the Empire city C: the Fun city D: the Windy city

中国大学MOOC: The basal layer also contains special cells called_______, which produce black pigment that gives color to the skin.

Who ______ the workers to take up the struggle A: called for B: called on C: called in D: called off

The basal layer also contains special cells called_______, which produce black pigment that gives color to the skin. A: adipocyte B: epithelium C: keratin D: melanocytes

John<br/>_______ the office as he was passing, but Mary was out. A: called for B: called up C: called on D: called at

Because the chairman of the board was absent, the meeting had to be ______. A: called out B: called on C: called off D: called up

The meeting had to be ____ because of the absence of chairman of the board. A: called out B: called off C: called on D: called up

The plan had been ________, which made him very angry. A: called off B: called up C: called in D: called on

Listen! Someone ________ for help! A: called B: is calling C: has called D: had called