问题
单项选择题
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
答案
参考答案：D
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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
参考答案：D