单项选择题

Excessive clearances in the main or crank-pin bearings will sometimes be indicated by （） before any bearing knock is heard.

A.loss of flow in the fuel system
B.loss of pressure in the air system
C.loss of flow in the lubricating system
D.loss of pressure in the lubricating system

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Engine （） refers to the relative time of position of crank, at which each operation during the cycle is commenced and is completed.

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