It is danger for vessels without the use of（）to approach the estuary in such poor visibility.<br>A:Loran C<br>B:Direction Finder<br>C:Gyro- compass<br>D:Radar

It is danger for vessels without the use of（）to approach the estuary in such poor visibility.
A:Loran C
B:Direction Finder
C:Gyro- compass
D:Radar

出自：海船船员证

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