单项选择题
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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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 -
单项选择题
The most important factor that causes the wear of the engine parts is （）.
A.excessive heat
B.friction
C.oxidation
D.high pressure -
单项选择题
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
