A.green lights
B.red lights
C.yellow lights
D.white lights
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A.mile board
B.dredging mark
C.passing daymark
D.crossing daymark
A.drilling
B.soil reactions
C.temperature
D.current
A.the starboard side of the channel
B.the centerline of the channel
C.an obstruction where the preferred channel is to starboard
D.special purpose areas
A.a black ball
B.a diamond shape
C.two cones，apexes together
D.one cone，apex upward
A.green squares
B.green triangles
C.red squares
D.red triangles
最新試題
A tug is towing three manned barges in line in fog. The first vessel of the tow should sound （）.
All fog signals shall be sounded every two minutes with the exception of a vessel（）.
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 vessel towing where the tow prevents her from changing course shall carry（）.
A power-driven vessel towing another vessel astern (tow less than 200 meters) shall show （）.
A power-driven vessel underway shall keep out of the way of（）.
A single towing light will be carried above a vessel’s sternlight（）.
The prohibition against displaying lights which may be confused with required navigation lights applies（）.
Some lights used as aids to marine navigation have a red sector to indicate a danger area. The limits of a colored sector of a light are listed in the Light List in which of the following manners?（）
At sea，you are approaching a small vessel and see that it has the signal flag P hoisted. What should you do?（）.