单项选择题

How many power strokes per crankshaft revolution are there in an eight cylinder, two stroke/cycle diesel engine?（）

A.One
B.Two
C.Four
D.Eight

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单项选择题

The highest pressure in a diesel engine cylinder normally occurs （）.

A.at TDC
B.before TDC
C.after TDC
D.during air starting

单项选择题

What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?（）

A.Spark plug
B.Heat of compression
C.Carburetor
D.Glow ping

单项选择题

The main purpose of the piston oil scraper rings is to （）.

A.seal the space between the piston and the liner
B.reduce the amount of lube oil burned in the combustion chamber
C.transmit heat from the piston to the cylinder liner
D.damp out fluctuations of the piston side thrust