Low compressor head pressure in a refrigeration system can be caused by（）.<br>A:insufficient condenser cooling water<br>B:excessive condenser cooling water<br>C:air in the refrigeration system<br>D:excessive refrigerant in the system

Low compressor head pressure in a refrigeration system can be caused by（）.
A:insufficient condenser cooling water
B:excessive condenser cooling water
C:air in the refrigeration system
D:excessive refrigerant in the system

出自：海船船员证

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