单项选择题
A.mean low water
B.the same as that used for the charts of the locality
C.the highest possible level
D.given in table three of the tide tables
单项选择题 The dangerous semicircle of a typhoon in the Southern Hemisphere is that area（）.
单项选择题 The dangerous semicircle of a hurricane in the Northern Hemisphere is that area of the storm （）.
单项选择题 The damage to a vessel is over $25，000. Who must notify the nearest Coast Guard Marine Safety or Marine Inspection Office as soon as possible? （）