单项选择题
What would NOT be a distress signal?（）.
A.MAYDAY sent by radiotelephone
B.Continuous sounding of fog horn
C.Green star shells fired from a launcher
D.Square flag and ball in a vertical line
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相关考题
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单项选择题
When two vessels are in immediate danger of collision，the stand-on vessel must（）.
A.abandon ship
B.assist in taking whatever action is necessary to avoid collision
C.hold course and speed
D.sound a distress signal
