单项选择题The pressurized air is usually cooled to increase the charge air ().

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


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1.单项选择题The pressure of pilot air is usually () than that of starting air.

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

2.单项选择题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

3.单项选择题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

4.单项选择题The position of the piston parts in relation to each other is secured by means of () in the crown.

A.a mark
B.a bolt
C.a dowel pin
D.a measuring tool

5.单项选择题The position of the interface between oil and water within the centrifuge is achieved by the use of ().

A.gravity disc
B.centrifugal bowl
C.a stack of discs
D.main sealing ring

6.单项选择题The position of () on the crosshead on a large diesel engine is determined by dowel pins.

A.the guideway
B.the piston rod
C.the crosshead shoes
D.the interlocked circlip

7.单项选择题The ports are drilled in the liners at an angle of approx 20℃ the result being that () is given a rotary movement.

A.the scavenging air
B.the exhaust gases
C.the mixed air
D.the spray oil

8.单项选择题The plunger may be rotated in the barrel by a rack and () on a sleeve which is keyed to the plunger.

A.pinion arrangement
B.push rod
C.handle bar
D.cam device

9.单项选择题The plunger in the fuel injector pump, usually operated by a (), is driven up and down when working.

A.crankshaft
B.camshaft
C.piston rod
D.rack and pinion

10.单项选择题The pistons are cooled by oil supplied from the forced () system.

A.fresh water
B.sea water
C.lubrication
D.fuel oil