A.Greenwich celestial meridian
B.hour circle of the body
C.local celestial meridian
D.vertical circle of the body
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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
A.the Canadian Coast Guard
B.Ice Sarnia
C.the Ice Navigation Center
D.the icebreaker assigned to the area
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Daylight savings time is a form of zone time that adopts the time（）.
Concerning a celestial observation，the azimuth angle is measured from the principal vertical circle to the（）.
Clouds form（）.
Clouds with the prefix “nimbo” in their name（）.
Conventional anchors are least likely to hold in a bottom consisting of（）.
Deck beams on a ship are generally spaced at equal intervals and run（）.
Considering the general circulation of the atmosphere，the wind system between latitudes 30°N and 60°N is commonly called the（）.
Dacron sails，when not in use，may be damaged if（）.
Channel 13 is primarily used for ship to ship communication. Channel 13 is also authorized for（）.
Coast Pilots and navigational charts are kept corrected and up-to-date by using the（）.