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單項(xiàng)選擇題

Charts are subject to frequent correction according to （）.

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

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

Navigational charts are subject to frequent changes，the important ones of which are promulgated by （）.

A.Admiralty Notices to Mariners
B.Mariner's Handbook
C.Catalogue
D.Sailing Directions

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