單項選擇題

A Mercator chart is a （）.

A.cylindrical projection
B.simple conic projection
C.polyconic projection
D.rectangular projection

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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

單項選擇題

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