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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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Engine operating conditions may be indicated by the color of the exhaust smoke Black smoke could indicate .A.an insufficient speed droop settingB.an overloaded engineC.clogged drain holes in the oil control ringsD.complete combustion
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翻译：As different computers display color differentlythe color of the actual item may vary slightly from the above images.
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