9 Class I : HUMAN-POWERED AIRCRAFT -An aerodyne which takes off and remains airborne using solely the muscular energy of one or more persons on board.
级:人类力飞行—一种重航空,使用飞行上一人或多人肌肉能量起飞和保持悬空。
9 Class I : HUMAN-POWERED AIRCRAFT -An aerodyne which takes off and remains airborne using solely the muscular energy of one or more persons on board.
级:人类力飞行—一种重航空,使用飞行上一人或多人肌肉能量起飞和保持悬空。
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