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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
单项选择题
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
单项选择题
A.the starting air supply is cut off and fuel is injected into the cylinders
B.the fuel feeding is cut off and the turning gear is put in
C.the starting air supply is cut off and turning gear is taken out
D.the electric blower is shut down and fuel is injected into the cylinders
单项选择题
A.suction stroke
B.compression stroke
C.power stroke
D.exhaust stroke
单项选择题
A.has nearly come to the TDC
B.has just past the TDC
C.has nearly come to the BDC
D.has just past the BDC
单项选择题
A.pilot air；pilot air
B.handle；solenoid
C.handle；pilot air coming through the distributor
D.solenoid；pilot air coming through the distributor
单项选择题
A.supplying high pressure oil into a hydraulic motor
B.supplying high temperature air into the cylinder
C.supplying high pressure air into the cylinder
D.electrical igniting
单项选择题
A.can be started at low temperature and are free from preheating
B.usually are preheated by steam before being started
C.are kept at a constant temperature and free from preheating
D.are kept at a low temperature to save energy
