单选题Exhaust pipes for separate diesel engines can be combined only when （）Aspace limitations prevent separately run pipesBthe engines are small auxiliary unitsCthey are arranged to prevent gas backflow to each engineDa waste heat boiler is installed
单选题
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
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