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單項選擇題

Increasing differential pressure of an oil filter indicates that （）

A.it is dirty
B.it is leaky
C.it has been renewed
D.all the above

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單項選擇題

Increased air （） will raise scavenge efficiency and allow a greater mass of air to be compressed； more fuel may now be burned giving an increased power.

A.specific volume
B.density
C.viscosity
D.calorific value

單項選擇題

In the suction stroke air is induced into the cylinder （）In the compression stroke the air is compressed.

A.by an fuel valve
B.through an inlet valve
C.with an exhaust valve
D.from an outlet valve

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