公共意识是独立自由的个体所具有的一种整体意识或整体观念。公共意识一方面是个人主体自由的体现，

The diesel engine is similar to the gasoline engine in that______.

A.both of them are ignited by compressed air

B.both of them are the forms of external combustion engines

C.both of them have spark plugs

D.the power is developed by the piston in the cylinder

Within the gasoline or the diesel engine, about () of the energy is used to drive the vehicle.

A.25%

B.33%

C.9%

D.all of the above

A.as much fuel as

B.less fuel than

C.less fuel as

D.more fuel than

A.ignition lag

B.engine horsepower

C.lube oil system pressure

D.specific fuel consumption

A.Crankshaft revolution

B.Type of engine (diesel or gasoline)

C.Distance a piston travels during a stroke

D.Number of pistons

The diesel engine is also called compression ignition engine because______.

A compression stroke is one of the four-strokes of a diesel engine.

B the diesel engine is ignited by the heat of compression not by spark .

C the diesel engine has a very high compression ratio.

D Both A and B

When was the gasoline engine ______ ？

A．found

B．discovered

C．invented

If an auxiliary diesel engine frequently stalls, the trouble may be caused by ___.

A.low exhaust back pressure

B.air in the fuel system

C.gasket blow –by or leakage

D.incorrect assembly of idler springs

A.most critical in a four-stroke cycle diesel engine

B.most critical in a two-stroke/cycle diesel engine

C.most critical in a four-stroke/cycle diesel engine if it is turbocharged

D.of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine

A the air is compressed in the sealed cylinder in the diesel engine

B the petrol engine has a comparatively very low compression ratio

C combustion occurs by spark ignition in the diesel engine

D Both A and B