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單項(xiàng)選擇題

ETA／PILOT REVERTING means （）．

A.ETA pilot station has been given
B.ETA pilot station will be given afterwards
C.ETA pilot station was not given
D.ETA pilot station is given

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單項(xiàng)選擇題

Data relating to the direction and velocity of rotary tidal currents can be found in the （）.

A.Mariner's Guide
B.Tidal Current Tables
C.Nautical Almanac
D.Tide Tables

單項(xiàng)選擇題

Coral atolls，or a chain of islands at right angles to the radar beam，may show as a long line rather than as individual targets due to （）.

A.the effects of beam width
B.limitations on range resolution
C.the pulse length of the radar
D.the multiple-target resolution factor