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
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A.Gray lines on the uppermost inset chart
B.Red lines on the main body of the chart
C.In parenthesis on the lines of equal magnetic variation
D.Annual rate of change is not shown
A.Chart No.1
B.Catalog of Charts
C.IMO Practical Navigator
D.IMO Light List
A.points of equal variation
B.points of zero variation
C.the magnetic latitude
D.magnetic dip
A.magnetic latitudes
B.magnetic declinations
C.dip
D.isogonic lines
A.complete and often very poor surveys
B.correct and often very good surveys
C.inadequate and often very old surveys
D.adequate and present surveys
最新試題
A chart with a scale of 1:80，000 would fall into the category of a（）.
The short-long dashed，magenta lines parallel to York River Entrance Channel mark（）．
What is NOT an advantage of the rhumb line track over a great circle track? （）
On chart，bearings to near objects should be used in preference to objects farther off，because（）.
Which information does the outer ring of a compass rose on a nautical chart provide（）.
When a buoy is in position only during a certain period of the year，where may the dates when the buoy is in position be found?（）
The revision date of a chart is printed on which area of the chart? （）
Which chart symbol indicates the bottom is clay（）.
When using a Lambert conformal chart in high latitudes，angles such as bearings are measured in reference to （）.
（）is not a position-fixing system.