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
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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
A.a black ball
B.a diamond shape
C.two cones，apexes together
D.one cone，apex upward
最新試題
If your vessel were proceeding down river (descending)，a green square marker with a green reflector border on the right bank would be a（）.
An inconspicuous，partly submerged vessel or object being towed，where the length of tow is 100 meters，shall show（）.
A towing light，according to the Rules，is a（）.
A vessel being towed astern，where the length of the tow exceeds 200 meters，will exhibit （）.
A tug is towing three manned barges in line in fog. The first vessel of the tow should sound （）.
A power-driven vessel towing another vessel astern (tow less than 200 meters) shall show （）.
Approaching an anchorage in fog，you hear one short，one prolonged，and one short blast in that sequence on a ship’s whistle． This indicates（）.
Lighted information markers show（）.
A power-driven vessel underway shall keep out of the way of（）.
A towing vessel 30 meters in length is pushing barges ahead. How many white masthead lights is the vessel REQUIRED to show at night?（）