单项选择题

The luminous range of a light takes into account the（）.

A.glare from background lighting
B.existing visibility conditions
C.elevation of the light
D.observer's height of eye

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单项选择题

Restricted areas at locks and dams are indicated by（）.

A.flashing red lights upstream and fixed red lights downstream
B.yellow unlighted buoys
C.signs and/or flashing red lights
D.red daymarks upstream and green daymarks downstream

单项选择题

Preferred channel buoys indicate the preferred channel to transit by（）.

A.odd or even numbers
B.the color of their top band
C.the location of the buoy in the channel junction
D.the buoy's light rhythms

单项选择题

Lighted white and orange buoys must show which color light?（）

A.Orange
B.White
C.Red
D.Alternating yellow and white