單項(xiàng)選擇題

A continuous sounding of a fog-signal apparatus indicates（）.

A.the vessel is in distress
B.the vessel has completed loading dangerous cargo
C.it is safe to pass
D.the vessel is anchored

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單項(xiàng)選擇題

All of the following are distress signals EXCEPT（）.

A.the continuous sounding of any fog signal apparatus
B.giving five or more short and rapid blasts of the whistle
C.firing a gun at intervals of about a minute
D.a barrel with burning oil in it，on deck

單項(xiàng)選擇題

All of the following are distress signals under the Rules EXCEPT（）.

A.a green star signal
B.orange-colored smoke
C.red flares
D.the repeated raising and lowering of outstretched arms