单项选择题
A.stronger B.thinner C.more corrosion resistant D.a lower grade steel
Compared to a low pressure system，generally the air in ...
单项选择题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
Commercial ships or other persons or agencies requiring...
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
Coiling new rope against the lay，bringing the lower end...
单项选择题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（）.
A.coiling B.faking C.flemishing D.thoroughfooting
