Under normal conditions, the quantity of air circulation becomes less and less.What is the reason?（）<br>A:dirty delivery ducts<br>B:too much refrigerant<br>C:the fouling filters<br>D:high temperature outside

Under normal conditions, the quantity of air circulation becomes less and less.What is the reason?（）
A:dirty delivery ducts
B:too much refrigerant
C:the fouling filters
D:high temperature outside

出自：海船船员证

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