A.show a fixed red light if lighted
B.show a Morse (A) white light
C.be square in shape
D.have an even number if numbered
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A.must be displayed when day signals are being used
B.must be displayed when moored to a pier
C.may be extinguished at night on open waters when no other vessels are in the area
D.may be displayed during daylight
A.green lights
B.red lights
C.yellow lights
D.white lights
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
最新試題
The duration of a prolonged blast of the whistle is（）.
A vessel being towed astern，where the length of the tow exceeds 200 meters，will exhibit （）.
At sea，you are approaching a small vessel and see that it has the signal flag P hoisted. What should you do?（）.
A towing vessel 30 meters in length is pushing barges ahead. How many white masthead lights is the vessel REQUIRED to show at night?（）
Navigation lights must be displayed in all weathers from sunset to sunrise. They also（）.
On entering from seaward，a starboard side daymark will（）.
A tug is towing three manned barges in line in fog. The first vessel of the tow should sound （）.
A triangular daymark would be colored（）.
A towing light is a yellow light having the same characteristics as a(n)（）
As defined in the Rules，a towing light is a yellow light having the same characteristics as a(n)（）.