Routine maintenance on a Central Control Room hermetically sealed air conditioning unit should include （）<br>A:changing the air filter<br>B:recharging the system<br>C:changing compressor lubricant<br>D:renewing container vacuum

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

出自：海船船员证

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