单项选择题
（）chart 3994，positions read from this chart should be shifted 0.03 minutes Northward．
A.To consider
B.To check
C.To examine
D.To agree with
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A.cylindrical projection
B.simple conic projection
C.polyconic projection
D.rectangular projection -
单项选择题
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 -
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All straight lines represent great circle tracks on a chart based on a(n) （）.
A.Mercator projection
B.polyconic projection
C.orthographic projection
D.gnomonic projection
