More exact assessment of visibility when ________ is used to determine the range of vessel or other objects in the vicinity．A.radarB.omegaC.satellite navigatorD.DF
More exact assessment of visibility when ________ is used to determine the range of vessel or other objects in the vicinity．
A.radar
B.omega
C.satellite navigator
D.DF
相关考题：
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单选题In restricted visibility, a vessel which detects by radar alone the presence of another vessel shall determine if a close quarters situation is developing or risk of collision exists. If so, she shall（）.Asound the danger signalBwhen taking action, make only course changesCavoid altering course toward a vessel abaft the beamDAll of the above
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单选题More exact assessment of visibility when（）is used to determine the range of vessel or other objects in the vicinity.AradarBomegaCsatellite navigatorDDF