The purpose of compressing the air within the cylinder of a diesel engine is to （）

A . seal the space between the piston and liner B . transmit heat from the piston to the cylinder liner C . reduce the amount of combustion gas blow-by D . all of the above

A . raised B . risen C . reduced D . maintained constant

A .https://assets.asklib.com/images/image2/2018072715124350961.jpg B .https://assets.asklib.com/images/image2/2018072715124925568.jpg C .https://assets.asklib.com/images/image2/2018072715125337253.jpg D .https://assets.asklib.com/images/image2/2018072715125650375.jpg

A . compression must be low for effective spark ignition B . compression must be low for required horsepower and torque generation C . compression must be low to prevent pre-ignition D . compression must be low to have effective pre-ignitio

A . Holding the valve open for a long period B . Increasing the starting air pressure used C . Opening the stating air valve quickly D . Reducing the starting air valve size

A . To keep all the members in the group work together． B . To make the people there understand the meaning of work． C . To find a way to solve the generation gap． D . To help people enjoy their work．

A . Higher compression ratios create higher temperature B . Higher temperatures create higher compression ratios C . low temperatures create higher compression ratios D . Higher compression ratios create low temperature

A . PowerVM B . VMControl C . Active Memory Sharing D . Active Memory Expansio

A . Control the amount of lube oil burned in the combustion chamber B . Transmit heat from the piston to the cylinder liner C . Prevent damage to ring groove inserts by acting as a heat dam D . Dissipate combustion chamber gas pressure by channeling it through the ring ga

A .  copy as backup B .  backup as copy C .  backup D .  copy

A . increased horsepower B . reduced efficiency C . increased heat loss D . lower cylinder pressure

A . water B . fresh air C . fuel oil D . ga

A . prevent excessive cylinder liner wear B . reduce friction losses in the engine C . seal the space between the piston and the liner D . limit upward flow of lube oil into the combustion space

A . evaporator B . compressor C . expansion valve D . condenser

A . provide energy to operate the engine between power impulses B . neutralize the primary inertia force of the crankshaft C . reduce the shock of starting loads on the main bearings D . prevent the engine from operating at critical speed

A . Open the machine on both ends so as to allow the air and dust to escape B . Be certain that the circuit breaker is opened and tagged on the feeder panel C . Be certain that the air is clean and as dry as possible D . All of the above

A . evaporator B . condenser C . expansion valve D . compressor

A . PowerVM B . VMControl C . Active Memory Sharing D . Active Memory Expansio

A . to need B . ready for C . want to D . going to be

A．To interest students in a career in counseling. B．To recruit counselors to work in the placement office. C．To inform. students of a university program. D．To convince local merchants to hire college students.