單項(xiàng)選擇題

In the cylinder head of a two-stroke/cycle diesel engine, valves are used for（）

A.air intake
B.a fuel outlet
C.cooling water inlets
D.exhausting combustion gas

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單項(xiàng)選擇題

Diesel engine piston seizure can be caused by （）

A.poor cooling of cylinder walls
B.improper cooling of the piston
C.insufficient piston lubrication
D.all of the above

單項(xiàng)選擇題

Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by（）

A.natural aspiration
B.masked intake valves
C.air cells
D.scavenging air