单项选择题
A.temperature of the air equals the temperature of the seawater B.atmospheric pressure is 14.7 lbs. per square inch C.relative humidity reaches 50% D.air becomes saturated with water vapor
The design specifications for cranes and crane foundati...
单项选择题The design specifications for cranes and crane foundations on ship’s are set and published by the（）.
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
