單項(xiàng)選擇題The process to remove exhaust gases by blowing in fresh air is called ().

A.charging
B.supercharging
C.starting
D.scavenging


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2.單項(xiàng)選擇題The primary duty of lube oil is to reduce () between the working parts of an engine.

A.power output
B.friction and wear
C.indicated pressure
D.rated horsepower

3.單項(xiàng)選擇題The pressurized air is usually cooled to increase the charge air ().

A.viscosity
B.density
C.velocity
D.electricity

4.單項(xiàng)選擇題The pressure of pilot air is usually () than that of starting air.

A.higher
B.lower
C.low
D.high

5.單項(xiàng)選擇題The power generated in the turbine must () that required by the compressor.

A.be less than
B.be larger than
C.be as large as
D.not be so large as