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
单项选择题 SWEEP INT on radar panel is the abbreviation of（）.
单项选择题 Radar reflectors are required for（）.
单项选择题 Radar makes it possible and much safer for us to sail（）.
