Which of the processes listed would be the most satisfactory method to use to lower the humidity of the air being circulated by an air conditioning system?

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

[单选题]Which of the listed factors will indicate the most about the ability of a fuel to ignite in a diesel engine?A．ViscosityB．Sulfur contentC．Pour pointD．Cetane number

[单选题]Which of the conditions listed will cause a refrigeration compressor to run constantly without simultaneously decreasing the temperature in the refrigerated space?( )A．Shortage of refrigerant oilB．Slight shortage of refrigerantC．Excessive condenser c

[单选题]Which of the substances listed is satisfactorily removed from the fuel by a centrifugal oil purifier?（）A . ImpuritiesB . Lube oilC . GasolineD . Diesel fuel

[单选题]Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?A．Pressure-reducing valveB．Unloading valveC．Counterbalance valveD．Pressure-relief valve

[单选题]Which of the units listed is used to combust waste in the engine room?A．BoilerB．IncineratorC．Generator

[单选题]Which of the listed conditions can be considered as the single greatest cause of accidents?A．SpeedB．Excessive knowledge or skillC．Human errorD．Excitement

[单选题]Which of the listed fire extinguishers cannot be easily recharged aboard ship?A．Soda acidB．Carbon dioxideC．Dry chemicalD．cartridge-operated Foam

[单选题]Which of the listed conditions can be considered as the single greatest cause of accident?A．SpeedB．Excessive knowledge or skillC．Human errorD．Excitement

[单选题]Which of the listed devices may be used as a digital device?A．variable resistorB．diodeC．strain gaugeD．thermistor

[单选题]To control and manage processes, which of the following data structures should be set up?A．PCTB．PCBC．PCMD．PCL