单项选择题

In an air conditioning system, low head pressure associated with a reciprocating compressor can be the result of （）

A.broken valve springs
B.tight drive belts
C.high line voltage
D.air in the system

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单项选择题

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

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Which of the following influences the position of the interface between the liquid seal and the oil in a purifier?（）

A.Height of the machine
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单项选择题

The compressor in an air-cooled condensing refrigeration system is short cycling on the high pressure cutout switch（）

A.system is overcharged with refrigerant
B.system is low on refrigerant
C.discharge valves are leaking excessively
D.discharge valves are leaking slightly