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

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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

單項(xiàng)選擇題

The position of the piston parts in relation to each other is secured by means of （） and a dowel pin in the crown.

A.bosses
B.through bolts
C.machine-turned recesses
D.long studs

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