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


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2.單項(xiàng)選擇題You are scanning the radar screen for a buoy fitted with racon. How should this signal appear on the PPI display?（）

A.Starting with a dash and extending radially outward from the target
B.As a broken line from center of PPI to the target
C.Starting with a dot and extending radially inward from the target
D.Starting with a dash and extending to the right of the target

3.單項(xiàng)選擇題Which statement is true concerning a vessel equipped with operational radar?（）.

A.The Master of the vessel must be on the bridge when the radar is in use
B.The radar equipment is only required to be used in restricted visibility
C.The use of a radar excuses a vessel from the need of a look-out
D.This equipment must be used to obtain early warning of risk of collision

4.單項(xiàng)選擇題Which statement is TRUE concerning a vessel equipped with operational radar?（）.

A.She must use this equipment to obtain early warning of risk of collision
B.The use of a radar excuses a vessel from the need of a look-out
C.The radar equipment is only required to be used in restricted visibility
D.The safe speed of such a vessel will likely be greater than that of vessels without radar

5.單項(xiàng)選擇題Which statement concerning the operation of radar in fog is TRUE?（）

A.Radar ranges are less accurate in fog
B.Navigation buoys will always show up on radar
C.A sandy beach will show up clearer on radar than a rocky cliff
D.Small wooden boats may not show up on radar