单项选择题X 纠错
A.the inlet port is opened by the up coming piston; the port is closed by the down going
B.the inlet valve is opened by the down going piston;the inlet valve is closed
C.the inlet port is opened by the down going piston;the port is closed by the up coming
D.the inlet valve is opened
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单项选择题
A.inevitable
B.harmful
C.helpful
D.unacceptable
单项选择题
A.increase in temperature
B.lose its energy partly
C.expand and do work
D.begin to be compressed
单项选择题
A.a modern diesel engine;a turbine wheel
B.a modem diesel engine;exhaust gases
C.a compressor;an exhaust gas turbocharger
D.a compressor;a turbine wheel
单项选择题
A.the supply of normal air and removal of compressed air
B.the supply of fuel oil and combustion of the atomized oil
C.the supply of fresh air and removal of exhaust gases
D.the supply of fresh air and removal of the extra heat
单项选择题
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
单项选择题
A.lubricating
B.cooling
C.cleaning
D.neutralizing
单项选择题
A.lubricating
B.cooling
C.sealing
D.cleaning
单项选择题
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
单项选择题
A.Large crosshead type;crossheads
B.High speed;the cylinders
C.Large crosshead type;the cylinders
D.Four-stroke;pistons and cylinders
单项选择题
A.removing heat and deposits
B.neutralizing acidic products
C.lubricating
D.improving combustion efficiency