视线关系（Line of Sight，LoS）
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1、By night，you sight the lights of a ves
By night，you sight the lights of a vessel engaged in underwater operations. If an obstruction exists on the port side of the vessel，it will be marked by（）.Aa floodlightBtwo red lights in a vertical lineCa single red lightDany visible light
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2、Which method of adjusting mooring line
Which method of adjusting mooring lines is MOST useful for leaving a boat free to rise and fall with the tide?（）ACrossing the spring linesBS...
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道岔主线 main line of turnout
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4、A vessel is “in sight” of another vess
A vessel is “in sight” of another vessel when（）.Ashe can be observed by radarBshe can be observed visually from the other vesselCshe can be plotted on radar well enough to determine her headingDher fog signal can be heard
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线路中心线 center line of track
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6、LOS（Line-of-sight）计算中，计算结果与哪些因素有关（）
LOS（Line-of-sight）计算中，计算结果与哪些因素有关（）A发射点（天线）位置B天线距地面高度C接收点（天线）位置D地貌情况