Condensate must be drained periodically from the air compressor receivers to prevent （）.<br>A:second stage cylinder lockup<br>B:oil sump contamination<br>C:faulty operation of pneumatic valves<br>D:corrosion of air receiver baffles

Condensate must be drained periodically from the air compressor receivers to prevent （）.
A:second stage cylinder lockup
B:oil sump contamination
C:faulty operation of pneumatic valves
D:corrosion of air receiver baffles

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