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哪个不是飞机未出厂时需要的三证?()
A.国籍登记证
B.电台证
C.适航证
D.维修合格证
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在建立运动方程时,以下哪个不是假设条件? Which of the following is not an assumption in establishing the equations of motion?A.忽略地球曲率 Ignore Earth CurvatureB.忽略地球自转 Ignore the Earth RotationC.忽略外力 Ignore external forcesD.飞机视为刚体 The vehicle is treated as a single rigid body
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4、在建立运动方程时,以下哪个不是假设条件? Which of the following is not an assumption in establishing the equations of motion?A.忽略地球曲率 Ignore Earth CurvatureB.忽略地球自转 Ignore the Earth RotationC.忽略外力 Ignore external forcesD.飞机视为刚体 The vehicle is treated as a single rigid body
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