Exhaust pipes for separate diesel engines can be combined only when （）<br>A:space limitations prevent separately run pipes<br>B:the engines are small auxiliary units<br>C:they are arranged to prevent gas backflow to each engine<br>D:a waste heat boiler is installed

Exhaust pipes for separate diesel engines can be combined only when （）
A:space limitations prevent separately run pipes
B:the engines are small auxiliary units
C:they are arranged to prevent gas backflow to each engine
D:a waste heat boiler is installed

出自：海船船员证

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