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单选题
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.
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。
B
航段是航路的一部分。航路的两端分别由地理位置或一个明确的无线电站点来确定。
C
航段即航路的一部分，起点和终点通常是一个地理位置或是一个固定的的无线电台定位点。
答案解析
正确答案：B
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