A.Selected Worldwide Marine Weather Broadcasts
B.your local newspaper
C.the Notice to Mariners
D.the daily weather map
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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
A.coiling
B.faking
C.flemishing
D.thoroughfooting
A.pilot charts
B.Notices to Mariners
C.Tide Tables
D.Current Tables
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Concerning a celestial observation，the azimuth angle is measured from the principal vertical circle to the（）.
Deneb is found in what constellation?（）
Define the acronym MSI（）.
Compared to a low pressure system，generally the air in a high is（）.
Clouds with the prefix “nimbo” in their name（）.
Chart legends which indicate a conspicuous landmark are printed in（）.
Cumulonimbus clouds are formed by（）.
Considering the general circulation of the atmosphere，the wind system between latitudes 30°N and 60°N is commonly called the（）.
Deck beams on a ship are generally spaced at equal intervals and run（）.
Conventional anchors are least likely to hold in a bottom consisting of（）.