单项选择题

（）is not used in modern radar.

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

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单项选择题

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

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? （）

A.Relative
B.TRUE
C.Compass
D.Magnetic