Lines on a chart which connect points of equal magnetic variation are called ______.
A.magnetic latitudes
B.magnetic declinations
C.dip
D.isogonic lines
第1题：
A revised print of a chart is made ______.
A.after every major hydrographic survey of the area covered by the chart
B.when there are numerous corrections to be made or the corrections are extensive
C.when a low-stock situation occurs and minor corrections are made
D.every two years to update the magnetic variation information
第2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3题：
Assignable cause or special variation is:
A . is indicated when a point falls outside the control limits.
B . is indicated when a point falls outside the specification limits.
C . is indicated when a run of seven or more points fall above the center line of a standard control chart.
D . is indicated when a run of seven or more points fall below the center line of a standard control chart.
E . A, C, and D.
第4题：
An isotherm is ______.
A.a line on a weather map connecting equal points of both temperature and pressure
B.an instrument that measures the climatological effects of temperature
C.a line connecting points of equal barometric pressure on a weather map
D.a line connecting points of equal temperature on a weather map
第5题：
How is the annual rate of change for magnetic variation shown on a pilot chart? ______.
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
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：
Isogonic lines are lines on a chart indicating ______.
A.points of equal variation
B.points of zero variation
C.the magnetic latitude
D.magnetic dip
第8题：
134 Assignable cause or special variation is:
A. is indicated when a point falls outside the control limits.
B. is indicated when a point falls outside the specification limits.
C. is indicated when a run of seven or more points fall above the center line of a standard control chart.
D. is indicated when a run of seven or more points fall below the center line of a standard control chart.
E. A, C, and D
第9题：
Your vessel is proceeding down a channel，and you see a pair of range lights that are in line dead ahead．The chart indicates that the direction of this pair of lights is 229°T，and variation is 6°W．If the heading of your vessel at the time of the sighting is 232°per standard magnetic compass，what is the correct deviation ________．
A.3°E
B.9°E
C.3°W
D.9°W
第10题：
Compass error is equal to the ______.
A.deviation minus variation
B.variation plus compass course
C.combined variation and deviation
D.difference between true and magnetic heading