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mechanical engineering heat transfer refrigeration and air conditioning
1. The relative humidity is defined as
(A): the mass of water vapour present in 1 kg of dry air
(B): the mass of water vapour present in 1 m3 of dry air
(C): the ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure
(D): the ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure.
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