单选题What preventative maintenance should be done frequently to diesel engine starting air receivers?（）ADrain the accumulated moistureBTest the relief valvesCWatch the temperature to prevent fluctuations in pressureDClean the interior to remove oil and foreign matter
单选题
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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