單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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

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The dew point is reached when the（）.

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The design specifications for cranes and crane foundations on ship’s are set and published by the（）.

The depth（）a shallow patch，lying about 1.3 miles southeastward of Nanshan Tou lighthouse reduces to about 6.1 meters.

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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.