Most air conditioning units have （） for adjusting the ratio of recirculated fresh airCare must be taken not to reduce the fresh air so that stuffiness or smells arise.<br>A:catch plates<br>B:dampers<br>C:regulating valves<br>D:fans

Most air conditioning units have （） for adjusting the ratio of recirculated fresh airCare must be taken not to reduce the fresh air so that stuffiness or smells arise.
A:catch plates
B:dampers
C:regulating valves
D:fans

出自：海船船员证

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