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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Charts showing the coast of Mexico are produced by the United States（）.
Clean air standards referred to as “Grade D” apply to compressed air for use in（）.
Control of fire should be addressed（）.
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（）.
Chronometer error may be found by（）.
Complete information on weather broadcasts throughout the world is contained in（）.
Compared to a low pressure system，generally the air in a high is（）.
Changing rescuers while carrying out artificial respiration should be done（）.
Daylight savings time is a form of zone time that adopts the time（）.
Class I and II private aids to navigation in or along navigable waters of the United States are listed in the（）.