单项选择题

The datum from which the predicted heights of tides are reckoned in the tide tables is（）.

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

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The dangerous semicircle of a typhoon in the Southern Hemisphere is that area（）.

A.measured from due south clockwise 180°
B.measured from due south counterclockwise 180°
C.to the left of the storm's track
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单项选择题

The dangerous semicircle of a hurricane in the Northern Hemisphere is that area of the storm （）.

A.to the right of the storm's track
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A.The owner of the vessel
B.The Master of the vessel
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