A.Mercator projection
B.polyconic projection
C.orthographic projection
D.gnomonic projection
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A.Summary of Corrections
B.Local Notice to Mariners
C.Daily Memorandum
D.Chart Correction Card
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
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
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A chart position enclosed by a square is a（n）（）.
（）is not a position-fixing system.
Charts showing the coast of Mexico are produced by the United States（）.
The path that a vessel is expected to follow，represented on a chart by a line drawn from the point of departure to the point of arrival，is the（）.
When using a Lambert conformal chart in high latitudes，angles such as bearings are measured in reference to （）.
The numeral in the center of a wind rose circle on a pilot chart indicates the （）.
The maximum difference between mean time and apparent time is （）.
The soundings on the imperial chart are measured in（）.
The arrangement of charts in the catalogue is（）.
A chart with a scale of 1:80，000 would fall into the category of a（）.