In an air conditioning system, low head pressure associated with a reciprocating compressor can be the result of （）<br>A:broken valve springs<br>B:tight drive belts<br>C:high line voltage<br>D:air in the system

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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