【单选题】Mechanical toy cars A, B, and C, each traveling at its own uniform. rate, started from the same point at the same time and raced a 400-meter course. When A crossed the finish line. B was 40 meters beh...
【单选题】SAGE needs a mechanical frog's eye to separate the important details from the unimportant ones picked up by its international network of radar 'eyes'.