航空器等级 aircraft classes 航机分类号码 aircraft classification number (ACN) 飞机离场证 aircraft clearance ..
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aircraft recognition classes 飞机识别课
·2,447,543篇论文数据，部分数据来源于NoteExpress
Gyroplanes have a significantly higher fatal accident rate than other classes of recreational aircraft.
表明旋翼机比传统机的事故率要高很多。
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The legacy Continental aircraft continue to have just two classes.
CNN: First-class vs. business: Is it worth the extra cost?
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