單項(xiàng)選擇題（）is not used in modern radar.

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


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1.單項(xiàng)選擇題（）is not a job of the radar antenna.

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

3.單項(xiàng)選擇題You are underway in thick fog. You have not determined if risk of collision exists. Which statement is TRUE?（）.

A.Your speed must be reduced to bare steerageway
B.A look-out is not required if the radar is on
C.Fog signals are only required when a vessel is detected by radar
D.The radar should always be kept on a short-range scale

4.單項(xiàng)選擇題You are underway in restricted visibility and hear a fog signal forward of the beam. Nothing appears on your radar screen. You must（）.

A.stop your engines
B.sound two prolonged blasts of the whistle
C.sound the danger signal
D.slow to bare steerageway