如图．转盘被分成了4部分。其中∠AOB=∠COD=90°，则随意转动转盘，指针指向∠AOB或∠COD所在区域

Which statement concerning GMDSS Radio Operator requirements is FALSE ________．

A.Each compulsory vessel must carry at least two licensed GMDSS Radio Operators at all times while at sea

B.Each compulsory vessel must carry at least two licensed Radio Operators at all times while at sea and may elect to carry a GMDSS Radio Maintainer as well

C.Communications involving safety of life at sea do not have to be logged as long as the compulsory vessel was not involved in such communications

D.While at sea，adjustments to，and the maintaining of，GMDSS equipment may be performed by the GMDSS Radio operator as long as the work is supervised by an onboard licensed GMDSS Radio Maintainer

When a vessel violates an oil pollution act，who may be held responsible？ ______.

A.Master only

B.Owners only

C.Licensed officer on watch

D.Any individual connected with the vessel

When a vessel violates the oil pollution laws，who may be held responsible？

A.Master only

B.Owners only

C.Licensed officers only

D.Any individual connected with the vessel involved in the operation

What are the vessel equipment and personnel requirements for GMDSS ________．

A.Two licensed GMDSS radio operators

B.Equipment carriage requirements

C.Distress alerting and response

D.All of the above

Which statement is false regarding the maintenance of GMDSS equipment at sea？

A.The GMDSS operator may not be the person designated to have primary responsibility for radio communications during distress incidents

B.Ships must carry at least one person who qualifies as a GMDSS maintainer for the maintenance and repair of equipment if the at sea maintenance option is selected

C.All at sea maintenance and repairs must be performed by, or under the supervision of a person holding a GMDSS First/Second Class Radio Electronic Certificate

D.The GMDSS maintainer may be the person responsible for ensuring that the watches are properly maintained and that the proper guard channels and the vessel’s position are entered in the DSC equipment

Risk of collision may exist ______.

A.if the compass bearing of an approaching vessel does NOT appreciably change

B.even when an appreciable bearing change is evident, particularly when approaching a vessel at close range

C.if you observe both sidelights of a vessel ahead for an extended period of time

D.All of the above

Water may boil up around the stern of a vessel in a channel due to ().

A.slack water when upbound

B.shallow water

C.a cross current

D.a head current

A.The safety of navigation or important meteorological warnings

B.The safety of a vessel or a person is in jeopardy

C.A vessel in need of immediate assistance

D.A coast station traffic list

A passenger vessel is underway. When may passengers visit the pilothouse？

A.Passengers are excluded from the pilothouse while underway

B.Passengers are permitted in the pilothouse during daylight hours only

C.Passengers are permitted to visit the pilothouse when authorized by the Master and officer of the watch

D.Passengers are permitted in the pilothouse when they are escorted by a ship's officer

A.very large vessel

B.a long tow

C.a vessel at close range

D.all A，B and C