單項選擇題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


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1.單項選擇題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

2.單項選擇題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

3.單項選擇題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

4.單項選擇題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

5.單項選擇題The pistons are cooled by oil supplied from the forced （） system.

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