A.the use of a poor quality oil
B.the deterioration of its properties
C.the formation of deposits
D.the reduction in heat transfer ability
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A.lubricating
B.cooling
C.cleaning
D.neutralizing
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
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