More exact assessment of visibility when（）is used to determine the range of vessel or other objects in the vicinity.<br>A:radar<br>B:omega<br>C:satellite navigator<br>D: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

出自：海船船员证

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