單項選擇題Impurities in the fuel oil will affect the operation of the engine, which has （） the use of separator and some other devices.

A.brought about
B.caused for
C.resulted from
D.led


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1.單項選擇題The lube oil to lubricate the surfaces of the cylinder liners is spread over by the （）.

A.sliding piston rings
B.engines camshaft
C.small pumps
D.forced feed system

2.單項選擇題The most important factor that causes the wear of the engine parts is （）.

A.excessive heat
B.friction
C.oxidation
D.high pressure

3.單項選擇題In the closed cooling system, the water （）.

A.is made to circulate out of the system
B.is made to circulate within the system
C.is made circulate within the system
D.is made circulate out of the system

4.單項選擇題If the temperature drops low enough, oil will not flow, （） just tell us the temperature.

A.Hash point
B.Viscosity
C.Pour point
D.Cetane number

5.單項選擇題The （） can tell us how much heat we can get from the burning of an oil.

A.viscosity
B.flash point
C.cetane number
D.calorific value