单选题Which one is not the component of a typical, marine pattern self-contained unit?（）Aa centrifugal fanBa direct expansion coolerCa hermetic compressorDa centrifugal pump
单选题
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
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解析：
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