Diesel engine lube oil can become contaminated as a result（）<br>A:the water produced during combustion<br>B:the sulfur in the fuel<br>C:unburned fuel oil<br>D:all of the above

Diesel engine lube oil can become contaminated as a result（）
A:the water produced during combustion
B:the sulfur in the fuel
C:unburned fuel oil
D:all of the above

出自：海船船员证

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