单项选择题

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

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SWEEP INT on radar panel is the abbreviation of（）.

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

单项选择题

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

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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