单项选择题

Valve lash, or clearance refers to the （）

A.clearance between the top of the valve stem and the rocker arm
B.compression of the valve springs
C.clearance between the valve seat inserts and the head
D.out of roundness of the fuel injection cams

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单项选择题

Auxiliary diesel engines can be automatically shut down as a result of （）

A.low lube oil temperature
B.low lube oil pressure
C.high exhaust temperature
D.high cooling water pressure

单项选择题

Which of the listed conditions can cause a diesel engine to use too much lube oil?（）

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D.Low lube oil temperature

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A.The oil oxidizes and forms carbon deposits
B.The viscosity increases
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D.Lubricating qualities of the oil are enhanced