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单选题
Excessive lubricating oil consumption in a running diesel engine can be caused by （）
A
clogged lube oil piping
B
excessive valve-guide clearance
C
high lube oil viscosity
D
low lube oil temperature
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单选题The oil lubricating diesel engine cylinders usually contain additives formulated to impart a high degree of alkalinity to （） the acid conditions.A
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