单项选择题
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（）.
单项选择题 Radar makes it possible and much safer for us to sail（）.
单项选择题 Radar beacons are transmitters designed to produce a（）on the screens of ship’s radar sets.
