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 Mercator chart is a （）.

A.cylindrical projection
B.simple conic projection
C.polyconic projection
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单项选择题

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A.after every major hydrographic survey of the area covered by the chart
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