单项选择题
The “urgent” priority should be used for messages（）.
A.concerning the Safety of Life at Sea (SOLAS)
B.detailing important navigational warnings
C.containing information concerning the safety of a mobile unit or person
D.concerning on-scene communications
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A.brisk prevailing winds
B.light airs and calms
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D.None of the above -
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One of the first actions to be taken by survivors when they have boarded an inflatable liferaft is to（）.
A.stream the sea anchor
B.take an anti-seasickness pill
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D.the minimum dam control level
