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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

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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

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