单项选择题

If the analysis of used lube oil indicates a high content of iron particles, this could indicate（）

A.corrosive deterioration of a bearing
B.inadequate air filtration
C.excessive ring and liner wear
D.excessive cooling of lubricating oil

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Late fuel injection timing is indicated by （）

A.lower than normal cylinder pressure and low exhaust temperature
B.lower than normal cylinder pressure and high exhaust temperature
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