單項選擇題

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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單項選擇題

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
D.ahead of the typhoon measured from the storm's track to 90°on each side

單項選擇題

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
B.measured from true north clockwise to 180°T
C.measured from true north counterclockwise to 180°T
D.between the ship's heading and the bearing to the eye

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

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

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