What preventative maintenance should be done frequently to diesel engine starting air receivers?（）<br>A:Drain the accumulated moisture<br>B:Test the relief valves<br>C:Watch the temperature to prevent fluctuations in pressure<br>D:Clean the interior to remove oil and foreign matter

What preventative maintenance should be done frequently to diesel engine starting air receivers?（）
A:Drain the accumulated moisture
B:Test the relief valves
C:Watch the temperature to prevent fluctuations in pressure
D:Clean the interior to remove oil and foreign matter

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