题目内容
A safety margin can be added to provide the option to stop on the runway in case of a____takeoff.
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In most such aircraft, any engine failure results in a rejected takeoff as a matter of course, since even____the end of the runway is preferable to lifting off with insufficient power to maintain flight.
在力的作用下，体内任意两点距离不变的物体称为刚体。
平衡即是静止,所以静力学只研究物体静止时的力学规律
力是物体间相互的机械作用，所以没有接触不会产生力的作用。
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