單項(xiàng)選擇題

It is easier to replace a dry cylinder liner than a wet one because（）

A.of the thin wall thickness
B.honing makes it easier to maintain the desired oil ilm
C.water seals are not required
D.it fits more loosely due to a decrease in heat transfer through the composite wall

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單項(xiàng)選擇題

Which of the turbo-charging methods listed directs the exhaust gases to the turbine at fairly uniform velocity and pressure?（）

A.Constant pressure
B.Pulse
C.constant velocity
D.Axial flow

單項(xiàng)選擇題

Which of the following problems will occur if the needle valve in a fuel injection nozzle sticks in the open position?（）

A.Fuel injection timing will change
B.Nozzle operation will be unaffected
C.Fuel will leak into the drain line
D.Fuel will not be delivered