单选题In motor ship, （） is often used to recover some of the heat carried in the exhaust gases from the main engine.Aan diesel oil heaterBa waste heat boilerCa fresh water generatorDall the above
单选题
In motor ship, （） is often used to recover some of the heat carried in the exhaust gases from the main engine.
A
an diesel oil heater
B
a waste heat boiler
C
a fresh water generator
D
all the above
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