单选题A vessel engaged in fishing must display a light in the direction of any gear that extends outward more than 150 meters. The color of this light is（）.A whiteB greenC redD yellow

On the high seas，a fog signal consisting of one prolonged blast followed by four short blasts would indicate the presence of a ______.

A.vessel being towed

B.fishing vessel engaged in trawling

C.vessel at anchor warning you of her location

D.power-driven pilot vessel on station underway

You are on a cargo vessel carrying toluol in bulk in portable tanks. Which is a requirement for pumping the toluol?

A.Hose connections to the tank must be made with a minimum of three bolts

B.There must be water pressure on the fire main

C.You must shut down if another vessel comes alongside

D.If transferring at anchor，you must display a red flag by day and a red light at night

According to the navigation rules, all of the following are engaged in fishing except a vessel ______.

A.Setting nets

B.Trawling

C.Using a dredging net

D.Trolling

A vessel trawling will display a ______.

A.red light over a white light

B.green light over a white light

C.yellow light over a red light

D.white light over a green light

A vessel sailing shall keep out of the way of all of the following vessels except a vessel ______.

A.not under command

B.engaged on pilotage duty

C.restricted in her ability to maneuver

D.engaged in fishing

A vessel engaged in ______ shall not impede the passage of any other vessel navigating within a narrow channel or fairway．

A.mine clearance operation

B.towing operation

C.dredging or surveying or underwater operation

D.fishing

A vessel is "engaged in fishing" when ______.

A.her gear extends more than 100 meters from the vessel

B.she is using any type of gear，other than lines

C.she is using fishing apparatus which restricts her maneuverability

D.she has any fishing gear on board

A power-driven fishing vessel is underway on the high seas and is not engaged in fishing． Which of the following factors determines what lights she will show？

A.Whether she is normally a fishing or a trawling vessel

B.Her gross tonnage

C.Her length

D.The type of gear she carries

A vessel showing a green light over a white light in a vertical line above the level of the sidelights is ______.

A.engaged in underwater construction

B.under sail and power

C.a pilot vessel

D.trawling

A vessel engaged in fishing shall not impede the passage of______following a traffic lane．

(1)．A power-driven vessel

(2)．a sailing vessel

(3)．any vessel

(4)．a vessel of less than 20 metres in length

A.(1)

B.(1) & (2)

C.(3)

D.(4)