Which flight condition of large jet airplane create the most severe flight hazard by generating wingtip vortices of the greatest strength?
单项选择题
Heavy, slow, gear and flaps up
heavy, slow, gear and flaps down
Heavy, fast, dear and flaps down
答案：A
【原题】： Which flight condition of large jet airplane create the most severe flight hazard by generating wingtip vortices of the greatest strength?
单项选择题
Heavy, slow, gear and flaps up
heavy, slow, gear and flaps down
Heavy, fast, dear and flaps down
【解析】：
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