fluctuates with the engine speed to some extent, independent of the engine speed
keeps constant at all engine speed, dependent on the engine speed to some extent
keeps constant at all engine speed, independent of the engine speed
is decided by the engine speed, constant at all engine speed
第1题：
quantity of fuel injected is decreased
quantity of fuel injected will always be increased
start of injection is advanced
duration of injection will always be greater
第2题：
deliver proper fuel quantity to the injection nozzle
provide rapid fuel injection cutoff
control fuel quantity entering the pump body
control fuel pressure delivered to the combustion chamber
第3题：
If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because the
A.cylinder compression pressure may not be high enough
B.cylinder compression temperature may be too high
C.fuel oil injection pressure may not be high enough
D.scavenge and purge process is incomplete
第4题：
avoid unnecessary pints inventory
keep torsional vibration constant
use existing supports and braces
maintain specified injection characteristics
第5题：
lower than normal cylinder pressure and low exhaust temperature
lower than normal cylinder pressure and high exhaust temperature
higher than normal cylinder pressure and low exhaust temperature
higher than normal cylinder pressure and high exhaust temperature
第6题：
viscosity is too low
temperature is too low
pump discharge pressure is higher than the systems pressure
pump capacity is greater than the systems needs
第7题：
a little lower
a little higher
too low
exactly the same
第8题：
What kind of pressure systems travel in easterly waves ________．
A.High pressure
B.Low pressure
C.Subsurface pressure
D.Terrastatic pressure
第9题：
Constant pressure system
Variable pressure system
Variable displacement system
Constant volume system
第10题：
carbon buildup in the exhaust manifold
overcooling of the exhaust manifold
eroded muffler baffle plates
high injection pressure