A.drilling
B.soil reactions
C.temperature
D.current
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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
A.a floodlight
B.two red lights in a vertical line
C.a single red light
D.any visible lights
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
最新試題
The duration of a prolonged blast of the whistle is（）.
A power-driven vessel underway shall keep out of the way of（）.
On entering from seaward，a starboard side daymark will（）.
A vessel towing where the tow prevents her from changing course shall carry（）.
A triangular daymark would be colored（）.
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（）.
All fog signals shall be sounded every two minutes with the exception of a vessel（）.
The prohibition against displaying lights which may be confused with required navigation lights applies（）.
Lighted information markers show（）.
Entering from seaward，triangular-shaped daymarks are used to mark（）.