Excessive clearances in the main or crank-pin bearings will sometimes be indicated by （） before any bearing knock is heard.<br>A:loss of flow in the fuel system<br>B:loss of pressure in the air system<br>C:loss of flow in the lubricating system<br>D:loss of pressure in the lubricating system

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

出自：海船船员证

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