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
The International Regulations for Preventing Collisions at Sea contain the requirements for （）.
A power-driven vessel，when towing astern，shall show（）.
Navigation lights must be displayed in all weathers from sunset to sunrise. They also（）.
According to the Rules，when should lights be displayed?（）.
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（）.
An inconspicuous，partly submerged vessel or object being towed，where the length of tow is 100 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（）.
Environmental loading consists of the forces caused by wind，waves，and（）.
Entering from seaward，triangular-shaped daymarks are used to mark（）.