A.lubricating
B.cooling
C.cleaning
D.neutralizing
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A.lubricating
B.cooling
C.sealing
D.cleaning
A.is coming upward;cylinder ring belt
B.is going downward;piston ring belt
C.is coming upward;piston ring belt
D.is going downward;cylinder ring belt
A.Large crosshead type;crossheads
B.High speed;the cylinders
C.Large crosshead type;the cylinders
D.Four-stroke;pistons and cylinders
A.removing heat and deposits
B.neutralizing acidic products
C.lubricating
D.improving combustion efficiency
A.camshaft;fresh air
B.camshaft;starting air
C.electronic motor which is controlled by a computer;fresh air
D.electronic motor which is controlled by a computer;starting air
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