单选题Routine maintenance on a Central Control Room hermetically sealed air conditioning unit should include （）Achanging the air filterBrecharging the systemCchanging compressor lubricantDrenewing container vacuum
单选题
Routine maintenance on a Central Control Room hermetically sealed air conditioning unit should include （）
A
changing the air filter
B
recharging the system
C
changing compressor lubricant
D
renewing container vacuum
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