题目内容：
直升机的起飞原理是（）。A．垂直起飞
B．短距离滑行
C．长距离滑行
D．垂直与滑行均可
参考答案：【答案仅供学习，请勿对照自行用药等】
单选：直升机的起飞原理是（）。A．垂直起飞B．短距离滑行C．长距离滑行D．垂直与滑行均可
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A．垂直起飞
B．短距离滑行
C．长距离滑行
D．垂直与滑行均可
A．垂直起飞
B．短距离滑行
C．长距离滑行
D．垂直与滑行均可
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