Concerning a celestial observation，the azimuth angle is measured from the principal vertical circle to the（）.

单项选择题Compliance with the terms of the load line certificate on a ship is the responsibility of the（）.

A.Ballast Control Operator
B.Barge Supervisor
C.Master or Offshore Installation Manager
D.operators representative

单项选择题Complete information on weather broadcasts throughout the world is contained in（）.

A.Selected Worldwide Marine Weather Broadcasts
B.your local newspaper
C.the Notice to Mariners
D.the daily weather map

单项选择题Compared to internal structural plating，the exterior hull plating on a ship is usually（）.

A.stronger
B.thinner
C.more corrosion resistant
D.a lower grade steel

单项选择题Compared to a low pressure system，generally the air in a high is（）.

A.warmer，less dense，and less stable
B.cool，more dense，and drier
C.muggy and cloudy
D.extremely moist with high relative humidity

单项选择题Commercial ships or other persons or agencies requiring the assistance of Canadian Coast Guard icebreakers should first contact（）.

A.the Canadian Coast Guard
B.Ice Sarnia
C.the Ice Navigation Center
D.the icebreaker assigned to the area