单项选择题

A.MAYDAY sent by radiotelephoneB.Continuous sounding of……

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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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