单项选择题

Burning fuel with a high sulfur content in a diesel engine will （）

A.increase thermal efficiency
B.cause clogging of the fuel system
C.increase the ability of the engine to start in cold weather
D.produce corrosion in the cylinder and exhaust system at low loads

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单项选择题

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

单项选择题

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

单项选择题

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