單項選擇題

Compared to internal structural plating，the exterior hull plating on a ship is usually（）.

A.stronger
B.thinner
C.more corrosion resistant
D.a lower grade steel

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單項選擇題

Compared to a low pressure system，generally the air in a high is（）.

A.warmer，less dense，and less stable
B.cool，more dense，and drier
C.muggy and cloudy
D.extremely moist with high relative humidity

單項選擇題

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