单项选择题

Fog is likely to occur when there is little difference between the dew point and the（）.

A.relative humidity
B.air temperature
C.barometric pressure
D.absolute humidity

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单项选择题

The company should establish and maintain procedures to control all documents and date which are relevant to（）.

A.ISM
B.SOLAS
C.DOC
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单项选择题

The dew point temperature is（）.

A.always higher than the air temperature
B.always lower than the air temperature
C.equal to the difference between the wet and dry bulb temperatures
D.the temperature at which the air is saturated with water vapor