单项选择题

The changes in the channel’s sands and buoys on this coast are （） this chart can not be considered as a safe guide of the channel．

A.frequent
B.so frequent
C.frequent that
D.so frequent that

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（）chart 3994，positions read from this chart should be shifted 0.03 minutes Northward．

A.To consider
B.To check
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A Mercator chart is a （）.

A.cylindrical 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
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