单项选择题
The dew point is reached when the（）.
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
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The design specifications for cranes and crane foundations on ship’s are set and published by the（）.
A.American Society of Mechanical Engineers
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The depth（）a shallow patch，lying about 1.3 miles southeastward of Nanshan Tou lighthouse reduces to about 6.1 meters.
A.above
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