单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
In the four-stroke engine, it takes （） to make one power stroke.
A.one propulsion
B.two propulsions
C.two revolutions
D.one revolution
