A.a cooling system
B.a lubrication oil system
C.an electric system
D.an injection system
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A.much
B.more
C.most
D.less
A.lower than；can lubricate
B.lower than；can cool
C.higher than；can enter
D.higher than ；cannot enter
A.the cylinder cover
B.the piston rings
C.the piston crown
D.the piston skirt
A.whatever
B.whenever
C.wherever
D.whoever
A.scavenging
B.starting
C.cooling
D.blowing
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