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單項(xiàng)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

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單項(xiàng)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

單項(xiàng)選擇題

In the sentence “In some designs the cylinder oil is timed so that the oil injects only on the piston ring belt, the "piston ring belt" means （）.

A.piston crown
B.piston ring groove
C.piston skirt
D.piston ring area

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