单选题Excessive clearances in the main or crank-pin bearings will sometimes be indicated by （） before any bearing knock is heard.Aloss of flow in the fuel systemBloss of pressure in the air systemCloss of flow in the lubricating systemDloss of pressure in the lubricating system
单选题
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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