Which one is not the component of a typical, marine pattern self-contained unit?（）<br>A:a centrifugal fan<br>B:a direct expansion cooler<br>C:a hermetic compressor<br>D:a centrifugal pump

Which one is not the component of a typical, marine pattern self-contained unit?（）
A:a centrifugal fan
B:a direct expansion cooler
C:a hermetic compressor
D:a centrifugal pump

出自：海船船员证

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