单选题A vessel the passage of which is not to be impeded（）to comply with this Rule when the two vessels are approaching one another so as to involve risk of collision.A remains fully obligedB has no obligationC is not necessarilyD is exempted

A vessel not to impede the passage of another vessel is not relieved ______ taking collision-avoiding action．

A.on

B.of

C.in

D.for

Services rendered notwithstanding the express and reasonable prohibition of the owner or the master of the vessel or the owner of any other property in danger _______ on board the vessel shall not give rise to payment under this Convention．

A.which is not and has not been

B.which was not

C.which was

D.which is not but will be taken by the salver

An overtaken vessel means a vessel________.

A.which has been overtaken by another vessel

B.which is going to overtake another vessel

C.which has overtaken another vessel

D.which is going to be overtaken by another vessel

For a floating vessel, the center of flotation is the point in the waterplane ______.

A.about which the vessel lists and trims

B.which coincides with the center of buoyancy

C.which, in the absence of external forces, is always vertically aligned with the center of gravity

D.which is shown in the hydrostatic tables as VCB

There are two areas off the N coast of France，which remain dangerous because of ______．

A.the density of vessel traffic on passage through the strait

B.the fact that the passage through the strait is constricted by a series of narrow banks，running NE-SW

C.mines lied in the war of 1939-1945

D.the strong tidal streams in the strait

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

You are crossing a narrow channel in a 15-meter vessel when you sight a tanker off your port bow coming up the channel. Which statement is TRUE?

A.Yours is the give-way vessel because it is less than 30 meters long

B.You shall not impede the safe passage of the tanker

C.The tanker is the stand-on vessel because it is to port of your vessel

D.The tanker is the stand-on vessel because it is the larger of the two vessels

Free Radio Pratique will be granted by the Port Health Office in the following case ______ ．

A.Vessel with a case or suspected case of infectious disease on board

B.Vessel with a dead body on board

C.Vessel which has visited plague-infected ports during the current voyage

D.Cargo vessel which hasn't called at any plague infected ports during the current voyage and on which there is not any case of infectious disease，or any dead body

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)