單項選擇題The 3-cm radar as compared to a 10-cm radar with similar specifications will（）.

A.give better range performance in rain，hail，etc
B.display small targets in a mass of dense sea clutter at a greater range
C.have less sea return in choppy rough seas
D.display a more map like presentation for inshore navigation


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1.單項選擇題The 10-cm radar as compared to a 3-cm radar of similar specifications will（）.

A.be more suitable for river and harbor navigation
B.provide better range performance on low lying targets during good weather and calm seas
C.have a wider horizontal beam width
D.have more sea return during rough sea conditions

2.單項選擇題SWEEP INT on radar panel is the abbreviation of（）.

A.sweep introduction
B.sweep interest
C.sweep intention
D.sweep intensity

3.單項選擇題Radar reflectors are required for（）.

A.all fishing vessels over 39 feet in length
B.sail-propelled fishing vessels
C.all fishing vessels of less than 200 GT
D.wooden hull fishing vessels with a poor radar echo

4.單項選擇題Radar makes it possible and much safer for us to sail（）.

A.in dense fog
B.in boisterous weather
C.in the open sea
D.in rivers

5.單項選擇題Radar beacons are transmitters designed to produce a（）on the screens of ship’s radar sets.

A.incorrect image
B.distinctive image
C.pictorial image
D.pictographic image