raise lube oil viscosity for easier starting in cold weather
increase air inlet temperature
increase compression ratio
increase jacket water temperature for easier starting in cold weather
第1题：
Power operated cranes used on a ship must not be powered by ______.
A.diesel engine
B.chargeable batteries
C.electric motors
D.gasoline engines
第2题：
connecting rods
crankshaft
crankcase
through bolts
第3题：
A、1200?
B、120?
C、12?
D、1.2?
第4题：
higher speed required
flywheel-effect
lower starting temperatures
higher compression pressures
第5题：
an electric motor
a diesel engine
a compressor
oil
第6题：
A hydraulic motor may be driven by______.
A.an electric motor
B.a diesel engine
C.a compressor
D.oil
第7题：
spring force
hydraulic pressure
centrifugal force
mechanical linkage
第8题：
Diesel engine electric starting motors generally require heavier duty motors and motors and operate at higher voltages than comparable starting motors for gasoline engines due to _____________.
A.higher speed required
B.flywheel-effect
C.lower starting temperatures
D.higher compression pressures
第9题：
sliding the camshaft along its axis
rotating the cam 180
rotating the cam followers 180
moving the idler sprockets in the drive chain
第10题：
they are more heavily built
the fuel used is less volatile
they can be easily reversed
they operate at a lower speed