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
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A.broken valve springs
B.tight drive belts
C.high line voltage
D.air in the system
In order to achieve greater dehumidification with an air conditioning system, you should （）
Ⅰ.reduce the cooling coil
Ⅱ.temperature increase the re-heater temperature
A.Ⅰonly
B.Ⅱ only
C.BothⅠandⅡ
D.NeitherⅠnorⅡ
A.Height of the machine
B.Temperature of the liquid seal
C.Gravity disc
D.Bowl diameter
A.system is overcharged with refrigerant
B.system is low on refrigerant
C.discharge valves are leaking excessively
D.discharge valves are leaking slightly
A.decrease
B.increase
C.decrease to zero
D.remain unchanged
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The treatment of the fuel oils involves storage, heating, filtering and（）
One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
The cetane rating of diesel fuel is an indication of the （）
For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?（）
Diesel engine air start system check valves are opened by （）
Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）
If separating effect is not good, which measure should be taken （）
During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.
By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a（）