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
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（）.
The arrangement of charts in the catalogue is（）.
A chart projection depicting the poles and a small area on either side of a connecting meridian，that is sometimes used for star charts，is the（）.
On chart，bearings to near objects should be used in preference to objects farther off，because（）.
A chart position enclosed by a square is a（n）（）.
The only cylindrical chart projection widely used for navigation is the （）.
The short-long dashed magenta line around Gardiners Island marks（）.
The numeral in the center of a wind rose circle on a pilot chart indicates the （）.
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?（）
A chart with a scale of 1:80，000 would fall into the category of a（）.