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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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单选题The knock occurring when a cold diesel engine is started and continues while running at low speed, but stops when the engine reaches normal operating speed and temperature, is（）.A
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Increasing exhaust temperatures before the turbineC
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单选题A ground in an electrical circuit outside the engine room （）.A
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Advanced ignitionB
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