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


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1.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

3.單項選擇題In the four-stroke engine, it takes （） to make one power stroke.

A.one propulsion
B.two propulsions
C.two revolutions
D.one revolution

4.單項選擇題In the event of the cylinder starting valve leakage （） would pass into the air pipes and ignite the oil deposited.

A.cooling water
B.vapor from the boiler
C.starting air
D.hot gases