單項(xiàng)選擇題In a weather report “GMT” stands for().

A.Greenwich Mean Time
B.Gross Mean Time
C.Great Mean Time
D.Gross Metric Ton


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1.單項(xiàng)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

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

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

4.單項(xiàng)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

5.單項(xiàng)選擇題The anchor was then()and the siren sounded.

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