单项选择题

A chart has extensive corrections to be made to it. When these are made and the chart is again printed，the chart issue is a （）.

A.first edition
B.new edition
C.revised edition
D.reprint

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单项选择题

Charts are subject to frequent correction according to （）.

A.Notices to Mariners
B.Mariner's handbook
C.Sailing Directions
D.Guide to Port Entry

单项选择题

Contour elevations on this chart refer to heights in feet above mean （）.

A.lower low water
B.high water
C.low water
D.sea level