單項選擇題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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1.單項選擇題Engine fuel pump index is ().

A.the viscosity index
B.the fuel oil contents
C.the starting speed
D.the reading at the rack

4.單項選擇題Engage the flywheel with the ().

A.turning gear
B.motor
C.driving gear
D.driven gear

5.單項選擇題Energy losses due to () occur in every machine.

A.speed
B.friction
C.impact
D.atmosphere