单项选择题
A.American Society of Mechanical Engineers B.American Petroleum Institute C.Society of Petroleum Engineers D.American Society of Civil Engineers
The depth（）a shallow patch，lying about 1.3 miles southe...
单项选择题The depth（）a shallow patch，lying about 1.3 miles southeastward of Nanshan Tou lighthouse reduces to about 6.1 meters.
A.above B.over C.up D.upon
The datum from which the predicted heights of tides are...
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
The dangerous semicircle of a typhoon in the Southern H...
单项选择题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
