For the unsaturated air, the relationship of size among the dry bulb temperature, wet bulb temperature and dew point temperature is ().

For the unsaturated air, the relationship of size among the dry bulb temperature, wet bulb temperature and dew point temperature is ().
A . Dry bulb temperature> Dew point temperature> Wet bulb temperature
B . Dry bulb temperature> wet bulb temperature> dew point temperature
C . Wet bulb temperature> dew point temperature> dry bulb temperature
D . wet bulb temperature> dry bulb temperature> dew point temperature

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Answer: B