单选题Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by （）Awater in the fuelBinsufficient fuel for combustionCclogged air intake passagesDburning lubricating oil
单选题
Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by （）
A
water in the fuel
B
insufficient fuel for combustion
C
clogged air intake passages
D
burning lubricating oil
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