單項選擇題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


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1.單項選擇題When visibility is 20 nautical miles, we say that visibility is().

A.very good
B.good
C.poor
D.moderate

3.單項選擇題Radar is not only to obtain(),but also to measure their distance away from you.

A.brightness of obtain
B.color of targets
C.shape of targets
D.bearing of objects

4.單項選擇題The anchor was then()and the siren sounded.

A.aweigh
B.weight
C.weigh
D.weighing

5.單項選擇題Are there many()and warehouses in the port?

A.wharf
B.wharves
C.wharve
D.wharfs