（）typically extends from close as 0.1 nautical miles out to 32 NM.

A.EBL
B.VRM
C.CRT
D.Grease pencil

A.To receive the high-frequency pulses from the transmitter
B.To focus the pulses into a beam，and send them into space
C.To pick up reflected pulses coming from objects that have been struck by the beam
D.To reflect microwaves