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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Coast Pilots and navigational charts are kept corrected and up-to-date by using the（）.
Changing rescuers while carrying out artificial respiration should be done（）.
Dacron sails，when not in use，may be damaged if（）.
Clouds with the prefix “nimbo” in their name（）.
Considering the general circulation of the atmosphere，the wind system between latitudes 30°N and 60°N is commonly called the（）.
Commercial ships or other persons or agencies requiring the assistance of Canadian Coast Guard icebreakers should first contact（）.
Conventional anchors are least likely to hold in a bottom consisting of（）.
Chart legends which indicate a conspicuous landmark are printed in（）.
Cumulus clouds that have undergone vertical development and have become cumulonimbus in form，indicate（）.
Charts showing the coast of Mexico are produced by the United States（）.