單項選擇題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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1.單項選擇題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

2.單項選擇題Lighted white and orange buoys must show which color light?()

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

4.單項選擇題At the magnetic equator there is no induced magnetism in the vertical soft iron because().

A.the lines of force cross the equator on a 0°-180°alignment
B.the quadrantal error is 0°
C.there is no vertical component of the Earth's magnetic field
D.the intercardinal headings have less than 1°

5.單項選擇題A vessel’s position should be plotted using bearings of().

A.buoys close at hand
B.fixed known objects on shore
C.buoys at a distance
D.All of the above