When air is at its dew point it is at its______.

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• The dew point of air is reached when the wet bulb temperature is （）.

  A . Twice the dry bulb temperature B . 10℃ above the dry bulb temperature C . 5℃ above the dry bulb temperature D . Equal to the dry bulb temperature

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• When fruit is carried as refrigerated cargo，the most frequent cause of its being infected at the discharge port is（）.

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• 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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• When starting an engine, the compressed air enters the cylinder when the corresponding piston is in position of its（）

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• Suppose the rated capacity of the main engine of a ship is 10,000 KW at 100 rated rpm, then when at 80 rpm its capacity should be （）.

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• The scavenging air ports are located at （） that they are just exposed by the upper edge of the piston when the piston is in the bottom dead center position.

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• When the dew point of the outside air is lower than or equal to the dew point of the air in the cargo hold，you should（）.

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• Relative humidity is the percentage of water vapor that is in the air as compared to the maximum amount it can hold at（）.

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• The amount of heat released by steam when it changes to water at the same temperature is called（）.

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• （）is a type of fog occurring close to the sea surface when the air is dry and cold-probably at least 9℃ below the sea surface temperature.

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• When air is at its dew point it（）.

  A . will contain no additional moisture B . has the lowest relative humidity C . cannot keep up its moisture D . has a low absolute humidity

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• In reference to air conditioning, when air attains the maximum amount of moisture it can hold at a specific temperature, it is said to be （）.

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• 173. When air is at its dew point it ______ .

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