is always less than 100%
is always more than 100%
is always equal to 90%
is always less than 90%
第1题：
is always less than 100%
is always more than 100%
is always equal to 90%
is always less than 90%
第2题：
operated manually once an hour
operated until the engine has started
placed into operation only at maximum load
adjustable to meet lubrication requirements
第3题：
Which of the following conditions is realized by the turbo-charging of a previously naturally aspirated diesel engine?
A.Ignition lag increases.
B.Lube oil system pressure increases.
C.Brake specific fuel consumption increases.
D.Mechanical efficiency increases.
第4题：
testing for the mechanical load and the thermal load
inspecting thermal and mechanical condition of the engine
inspecting each system and exhaust temperature
testing for compress pressure and explosion pressure
第5题：
prevent engine back pressure at heavy loads
increase total engine efficiency at low loads
prevent boiler corrosion at low engine loads
improve engine fuel consumption at any load
第6题：
because
since
due to
owing to
第7题：
Intake manifold
Water-cooled exhaust system
After-cooler
Exhaust diffuser
第8题：
Impeller
Compressor
After-cooler
Exhaust differ
第9题：
small than
more than
little than
less than
第10题：
in such cases, the air supply is no longer optimal, the thermal load will be higher
governor hunting will occur
torsional vibrations as other mechanical vibrations may occur
all of the above are correct