A revised print of a chart is made （）.<br>A:after every major hydrographic survey of the area covered by the chart<br>B:when there are numerous corrections to be made or the corrections are extensive<br>C:when a low-stock situation occurs and minor corrections are made<br>D:every two years to update the magnetic variation information

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

出自：海船船员证

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