Noise in a refrigeration compressor can be caused by （）.<br>A:worn bearings and piston pins<br>B:slugging due to flooding back<br>C:too much oil in circulation<br>D:All of the above

Noise in a refrigeration compressor can be caused by （）.
A:worn bearings and piston pins
B:slugging due to flooding back
C:too much oil in circulation
D:All of the above

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