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单选题
If sludge accumulates on the underside of a diesel engine piston, it will（）
A
cause blow-by
B
chemically attack the piston skirt
C
form an emulsion of lube oil and water
D
raise the piston temperature
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单选题The sludge tank installed in the diesel engine room is used to collect（） Ⅰ.sludge from the fuel oil settling tanks ad centrifuge Ⅱ.water that has been collected in the settling tankA
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