A.When at anchor，the pilot vessel is only required to sound anchor signals
B.The identification signal must be sounded any time the pilot vessel is underway
C.The pilot vessel may only sound the identity signal when making way
D.All of the above
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A.Greenwich celestial meridian
B.hour circle of the body
C.local celestial meridian
D.vertical circle of the body
A.Ballast Control Operator
B.Barge Supervisor
C.Master or Offshore Installation Manager
D.operators representative
A.Selected Worldwide Marine Weather Broadcasts
B.your local newspaper
C.the Notice to Mariners
D.the daily weather map
A.stronger
B.thinner
C.more corrosion resistant
D.a lower grade steel
A.warmer，less dense，and less stable
B.cool，more dense，and drier
C.muggy and cloudy
D.extremely moist with high relative humidity
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Compared to internal structural plating，the exterior hull plating on a ship is usually（）.
Changing rescuers while carrying out artificial respiration should be done（）.
Charts showing the coast of Mexico are produced by the United States（）.
Coast Pilots and navigational charts are kept corrected and up-to-date by using the（）.
Clouds form（）.
Cyclones that have warm sectors usually move（）.
Day-shapes must be displayed（）.
Control of fire should be addressed（）.
Daylight savings time is a form of zone time that adopts the time（）.
Chronometer error may be found by（）.