If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably （）.<br>A:misalignment or worn main bearings<br>B:insufficient cylinder lubrication<br>C:defective or poorly fitted valves<br>D:all of the above

If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably （）.
A:misalignment or worn main bearings
B:insufficient cylinder lubrication
C:defective or poorly fitted valves
D:all of the above

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