单选题Engine operating conditions may be indicated by the color of the exhaust smoke.Black smoke could indicate（）Aan insufficient speed droop settingBan overloaded engineCclogged drain holes in the oil control ringsDcomplete combustion
单选题
Engine operating conditions may be indicated by the color of the exhaust smoke.Black smoke could indicate（）
A
an insufficient speed droop setting
B
an overloaded engine
C
clogged drain holes in the oil control rings
D
complete combustion
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