White smoke exhausting from an operating diesel engine may indicate （）<br>A:a cracked liner<br>B:burning lube oil<br>C:an overloaded engine<br>D:insufficient combustion air

White smoke exhausting from an operating diesel engine may indicate （）
A:a cracked liner
B:burning lube oil
C:an overloaded engine
D:insufficient combustion air

出自：海船船员证

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