单项选择题

During the day，a vessel with a tow over 200 meters in length will show（）.

A.a black ball
B.a diamond shape
C.two cones，apexes together
D.one cone，apex upward

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单项选择题

Daymarks marking the starboard side of the channel when going towards the sea are（）.

A.green squares
B.green triangles
C.red squares
D.red triangles

单项选择题

By night，you sight the lights of a vessel engaged in underwater operations. If an obstruction exists on the port side of the vessel，it will be marked by（）.

A.a floodlight
B.two red lights in a vertical line
C.a single red light
D.any visible lights

单项选择题

At sea，you are approaching a small vessel and see that it has the signal flag P hoisted. What should you do?（）.

A.Proceed on present course and speed since the vessel is stopped and making no way through the water
B.Keep clear of the vessel because it has a diver down
C.Attempt to call the vessel on VHF radiotelephone because someone on board requires medical assistance
D.Approach with caution because the vessel is a fishing vessel and its nets are fouled on an obstruction