Cly
Cla
Cl
C
第1题：
Charted depth is the ______.
A.vertical distance from the chart sounding datum to the ocean bottom，plus the height of tide
B.vertical distance from the chart sounding datum to the ocean bottom
C.average height of water over a specified period of time
D.average height of all low waters at a place
第2题：
The buoy symbol printed on your chart is leaning to the northeast. This indicates ______.
A.you should stay to the north or east of the buoy
B.you should stay to the west or south of the buoy
C.the buoy is a major lighted buoy
D.nothing special for navigational purposes
第3题：
Which is not a symbol of Halloween?
A、The Christmas tree
B、The witch
C、Children
D、The turkey
第4题：
The symbol which appears beside a light on a chart reads Gp Fl R (2) 10 sec 160 ft 19M. Which characteristic describes the light?
A.It is visible 10 miles
B.Its distinguishing number is 19M
C.It has a radar reflector
D.None of the above
第5题：
The compass rose on a nautical chart indicates both variation and ______.
A.deviation
B.annual rate of variation change
C.precession
D.compass error
第6题：
The agonic line on an isomagnetic chart indicates the ______.
A.magnetic equator
B.magnetic longitude reference line
C.points where there is no variation
D.points where there is no annual change in variation
第7题：
The chart symbol indicating that the bottom is coral is ______.
A.C
B.Cl
C.Co
D.c
第8题：
On a chart, the characteristic of the light on a lighthouse is shown as flashing white with a red sector. The red sector ______.
A.indicates the limits of the navigable channel
B.indicates a danger area
C.is used to identify the characteristics of the light
D.serves no significant purpose
第9题：
The revision date of a chart is printed on which area of the chart?
A.Top center
B.Lower-left corner
C.Part of the chart title
D.Any clear area around the neat line
第10题：
A Doppler speed log indicates speed through the water ______.
A.at all times
B.in the bottom return mode
C.in the volume reverberation mode
D.only when there is no current