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
Entering from seaward，triangular-shaped daymarks are used to mark（）.
As defined in the Rules，a towing light is a yellow light having the same characteristics as a(n)（）.
A towing light，according to the Rules，is a（）.
A power-driven vessel underway shall keep out of the way of（）.
Navigation lights must be displayed in all weathers from sunset to sunrise. They also（）.
A safe water daymark has what shape? （）
An inconspicuous，partly submerged vessel or object being towed，where the length of tow is 100 meters，shall show（）.
An all-round flashing yellow light may be exhibited by a(n)（）.
According to the Rules，when should lights be displayed?（）.
Lighted information markers show（）.