单项选择题

Which of the following problems may occur when using fuel oil with a high sulphur content?（）

A.Injection lag
B.Lube oil dilution
C.Pre-ignition
D.Corrosion

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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

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

A.compression pressure in the cylinder will be higher
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