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

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单项选择题

A.coiling
B.faking
C.flemishing
D.thoroughfooting

单项选择题

A.pilot charts
B.Notices to Mariners
C.Tide Tables
D.Current Tables

单项选择题

A.are sheet or layer clouds
B.have undergone great vertical development
C.are middle or high altitude clouds
D.are rain clouds