单项选择题
（）typically extends from close as 0.1 nautical miles out to 32 NM.
A.EBL B.VRM C.CRT D.target tracking range
单项选择题 （）is not used in modern radar.
单项选择题 （）is not a job of the radar antenna.
单项选择题 You are using a radar in which your own ship is shown at the center，and the heading flash always points to 0°. If bearings are measured in relation to the flash，what type of bearings are produced? （）
