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

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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

单项选择题

In plotting a running fix，how many fixed objects are needed to take your lines of position from? （）

A.Three
B.Two
C.One
D.None