Route segment is a part of a route, each end of which is identified by: a geographical location; or a point at which a definite radio fix can be established.
答案解析
解析：
接下来，我们来看选项A、B、C。选项A正确地解释了航段的定义，即航段的两端可以是一个地理位置或一个无线电定位点。选项B和C在表述上存在一些不准确或不清晰的地方，因此不是正确答案。
举个生动有趣的例子来帮助理解：想象一架飞机在飞行过程中需要按照预定的航线飞行，这条航线被分成了若干个航段。每个航段的起点和终点可以是一个明确的地理位置，比如一个城市或者一个山脉，也可以是一个无线电定位点，比如一个雷达站。飞行员通过依次飞越这些航段，就能够安全地到达目的地。
因此，正确答案是A：航段是航线的一部分，它的两端可以是一个地理位置或一个无线电定位点。
相关知识点：
航段两端确定方式要记牢
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