单选题（） are fitted in the exhaust system and facilitate charge removal and scavenging in each cylinder.ADiffusersBCompressorsCSteam boilersDSoot blowers
单选题
（） 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
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