A.mile board
B.dredging mark
C.passing daymark
D.crossing daymark
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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
A.a floodlight
B.two red lights in a vertical line
C.a single red light
D.any visible lights
最新試題
The International Regulations for Preventing Collisions at Sea contain the requirements for （）.
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（）.
If your vessel were proceeding down river (descending)，a green square marker with a green reflector border on the right bank would be a（）.
A vessel being towed astern，where the length of the tow exceeds 200 meters，will exhibit （）.
On entering from seaward，a starboard side daymark will（）.
An all-round flashing yellow light may be exhibited by a(n)（）.
A towing light，according to the Rules，is a（）.
A power-driven vessel underway shall keep out of the way of（）.
According to the Rules，when should lights be displayed?（）.
All fog signals shall be sounded every two minutes with the exception of a vessel（）.