later and close sooner
sooner and close later
sooner and close sooner
later and close later
第1题：
point of opening
speed of opening
lift from its seat
all of the above
第2题：
fuel pumps
cylinders
fuel strainers
all of above
第3题：
If a diesel engine turned over freely but failed to start, the cause could be ________.
A.water in the fuel
B.cold lube oil
C.excessive starting air pressure
D.excessive fuel pressure
第4题：
fuel lines
lube oil filter
crank case pump
rocker arm reservoir
第5题：
excessively late injection timing for each cylinder
incorrectly adjusted intake valve timing
incorrectly adjusted fuel injector
incorrectly adjusted intake valve clearance
第6题：
the engine is overloaded
the engine is cold
there is too much lube oil in the cylinders
the turbocharger is fouled
第7题：
clogged lube oil piping
excessive valve-guide clearance
high lube oil viscosity
low lube oil temperature
第8题：
increase
decrease
remain the same
increase on compression decrease on expansion
第9题：
most critical in a four-stroke cycle diesel engine
most critical in a two-stroke/cycle diesel engine
most critical in a four-stroke/cycle diesel engine if it is turbocharged
of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine
第10题：
increased engine breathing efficiency
excessive valve lash
excessive lube oil consumption
lower than normal fuel consumption