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单选题
MAYDAY是()信号.
A
无线电传紧急
B
无线电话遇险
C
无线电传安全
D
无线电话紧急
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Icebergs may travel in a direction many degrees different from the sea iceB
Both icebergs and sea ice will move in approximately the same direction and at the same speedC
Icebergs and sea ice will move in the same direction,but at different speeds due to the sail effect of the bergD
Icebergs and sea ice will move in the same direction,but the iceberg will move slower because of its underwater bulk
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在烟囱或者桅的后面,高于尾灯的位置。B
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Ⅰ,Ⅱ,Ⅴ,ⅥD
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