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The current emphasis in general aviation (GA) safety is on visual angle of attack (AOA) indicators and impossible turns (return to the airport following engine failure). The many analyses and videos on these topics have been done in what can best be described as laboratory conditions, carefully...
【单选题】听力原文:M: Does the boss check up on you often?W: Indeed she does.It seems as though she's in here three or four times an hour, although it's not really that often.Q: What does the boss do?(19) A. She sends her employees for frequent medical check. B. She lea...
"The real question is what this means for severity of disease" if that occurs, and whether such people can infect others, she said. One expert saw the report as good news. Dr. Paul Offit, a vaccine expert at Children's Hospital of Philadelphia, said it's encouraging the reported reinfec...