单项选择题

In some modern large diesel engines, which of the following is used as the support for the main bearings?（）

A.Bedplate
B.Block
C.Base
D.Sump

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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

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?（）

A.Dirty lube oil filter
B.Too much piston ring wear
C.High lube oil viscosity
D.Low lube oil temperature