Passage 2
In about two years, NASA astronauts will go into space with personal assistants. Robotic assistants, of course. About the size of softballs, these personal satellite assistants (PSAs) can float throughout the space shuttle or space station, automatically monitoring life support systems, snapping photos, and taking over monitoring tasks from failed sensors. They're equipped with collision avoidance system so they won't bump into anything Naturally, they're wireless. Thanks to their videoconferencing capabilities, the PSAs offer a virtual presence for ground crews and scientists, letting them advise astronauts--in real time --in the midst of their experiments. The PSAs. will be stowed until the spacecraft reaches orbit (天体运行的轨道). And then activated by the astronauts, ground crews, or even by the spacecraft itsel A. With the help of PSAs, the ground crews and scientists can present in real time in the spacecraft. B. With the help of PSAs, the ground crews and scientists can control the spacecraft as if they were there. C. With the help of PSAs, the ground crews and scientists cannot in real time present in the spacecraft. D. With the help of PSAs, the ground crews and scientists cannot advise the astronauts to deal with different situations. 我来回答: 提交
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