空降兵跳伞,在他们离开飞机、打开降落伞之前的一草段时间内,其下降的速度越来越大。这一过程中空降兵的 [ ...
D
空降兵跳伞,在他们离开飞机、打开降落伞之前的一段时间内,其下降的速度越来越大来自.这一过程中空降兵的( )
spanD解析:解:空降兵跳伞,在他们离开飞机、打开降落伞之前少的一段时间内,质量与种不变,其下降的速度越来越大,动能越来越大;高度越来越小,重力势能越来越小.故选D.
空降兵跳伞次数和翼装飞行相比谁多
现在跳伞和翼装飞行,还是跳伞多点,翼装是特种作战
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为什么空降兵降落数秒时要喊「0001秒,0002秒」,而非「1秒,2秒」?
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