题目内容

The purposes of the _____ are to deliver clean engine oil and to reduce friction .

A. engine lubrication system
B. engine cooling system
C.crank mechanism
D. valve train

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the main Jobs of the______ are lubricating , cooling , cleaning and sealing

A. radiator
B. oil filter
C. engine oil
D. cooling fan

Which component belongs to neither the lubrication nor cooling system ?

A. Piston
B.Oil pump
C. radiator
D. Cooling fan

main components of lubrication system( )

A. radiator
B. oil pump
C. antifreeze
D. oil pan

oil filter