A、catch plates
B、dampers
C、regulating valves
D、fans
更多“Most air conditioning units have （） for adjusting the ratio of recirculated fresh airCare must be taken not to reduce the fresh air so that stuffiness or smells arise.”相关的问题
A、air being warmed above the dew point B、saturation of cold air by rain C、a rapid cooling of the air near the surface of the Earth at night D、warm moist air being blown over a colder surface
A、A.air being warmed above the dew point B、B.saturation of cold air by rain C、C.a rapid cooling of the air near the surface of the Earth at night D、D.warm moist air being blown over a colder surface
A、Cooling the air to a temperature just above dew point B、Heating the air to a point at which moisture will boil off ,then re-cooling it C、Cooling the air to a point below dew point, then reheating it D、Heating the air and then cooling it to a point below dew point
A、steam plants, electric motors and compressed air B、diesel engine, hydraulic machinery and compressed air C、steam plants, electric motors and hydraulic machinery D、diesel engines, steam plants and hydraulic machinery
A、compressed air and nitrogen B、helium and nitrogen C、oxygen and hydrogen D、oxygen and acetylene
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