（） are fitted in the exhaust system and facilitate charge removal and scavenging in each cylinder.<br>A:Diffusers<br>B:Compressors<br>C:Steam boilers<br>D:Soot blowers

（） are fitted in the exhaust system and facilitate charge removal and scavenging in each cylinder.
A:Diffusers
B:Compressors
C:Steam boilers
D:Soot blowers

出自：海船船员证

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