A.stronger
B.thinner
C.more corrosion resistant
D.a lower grade steel
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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
A.are sheet or layer clouds
B.have undergone great vertical development
C.are middle or high altitude clouds
D.are rain clouds
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Coiling new rope against the lay，bringing the lower end up through the center of the coil，then coiling with the lay，in order to remove the kinks，is known as（）.
Commercial ships or other persons or agencies requiring the assistance of Canadian Coast Guard icebreakers should first contact（）.
Clean air standards referred to as “Grade D” apply to compressed air for use in（）.
Day-shapes must be displayed（）.
Complete information on weather broadcasts throughout the world is contained in（）.
Compared to internal structural plating，the exterior hull plating on a ship is usually（）.
Charts showing the coast of Mexico are produced by the United States（）.
Dacron sails，when not in use，may be damaged if（）.
Concerning the identification signal for a pilot vessel，in fog，which statement is TRUE?（）
Corrosive liquids and acids should have which kind of label?（）