单选题The diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to （）Aprevent engine back pressure at heavy loadsBincrease total engine efficiency at low loadsCprevent boiler corrosion at low engine loadsDimprove engine fuel consumption at any load
单选题
The diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to （）
A
prevent engine back pressure at heavy loads
B
increase total engine efficiency at low loads
C
prevent boiler corrosion at low engine loads
D
improve engine fuel consumption at any load
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