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【单选题】
世界一级方程式赛车锦标赛中，“红旗”代表（）
A.
赛道上有障碍物，小心驾驶
B.
前方有慢速行驶车辆，小心驾驶
C.
比赛提前结束或暂停
D.
赛道障碍已经清除，恢复正常
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参考答案：
参考解析：
刷刷题刷刷变学霸
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【单选题】Ultralight (超轻型的) airplanes are a recent development in aviation that provide what aviation enthusiasts have long been seeking: born of the marriage of the hang glider and the go-kart (轻型单座赛车) engine ...
A.
the weight of the hang glider and that of the ultralight airplane
B.
ultralight airplanes and military aircraft
C.
the inventiveness of John Moody and that of Octave Chanute
D.
the controls used in the Wright brothers’ flyer and those used in today’s ultralight air-planes