單項(xiàng)選擇題

Leaking oil seals on a diesel engine turbocharger can cause（）

A.the engine to run after the fuel has been secured
B.the engine to over-speed
C.a fire
D.all of the above

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If the back clearance of a piston ring is excessive,（）

A.compression pressure in the cylinder will be higher
B.carbon will accumulate behind the ring
C.combustion gases will penetrate beneath the ring land
D.piston side thrust will be increased

單項(xiàng)選擇題

Corrosion and grooving on the blade of an exhaust driven turbocharger is caused by certain components of residual fuel oilsThese components are vanadium,sodium, and（）

A.copper
B.carbon
C.hydrogen
D.sulfur