Additional heat extraction from the exhaust gases can be effected by adding an （） section to the unit in plants.<br>A:air cooler<br>B:economizer<br>C:injector<br>D:air blower

Additional heat extraction from the exhaust gases can be effected by adding an （） section to the unit in plants.
A:air cooler
B:economizer
C:injector
D:air blower

出自：海船船员证

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