单选题Which of the routine maintenance procedure listed is required for starting air receivers?（）AFrequent draining of accumulated moistureBFrequent testing of relief valvesCA close watch on temperature to prevent fluctuations in pressureDFrequent cleaning to re move oil and foreign matter
单选题
Which of the routine maintenance procedure listed is required for starting air receivers?（）
A
Frequent draining of accumulated moisture
B
Frequent testing of relief valves
C
A close watch on temperature to prevent fluctuations in pressure
D
Frequent cleaning to re move oil and foreign matter
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