單項選擇題Shims of different thicknesses are inserted between the shells to enable adjustment of ().

A.the bearing clearances
B.the bearing thickness
C.the bearing strength
D.the bridge hardness


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1.單項選擇題Sediment collects in a tubular purifier ().

A.on top cover
B.on sides of bowl
C.in drain line on the discs
D.on the discs

2.單項選擇題Sea water is not used directly as a coolant because of ().

A.low specific heat
B.high specific heat
C.corrosive action
D.high viscosity

3.單項選擇題Sea water is not directly used as a coolant for engines because of its ().

A.low specific heat
B.corrosive action
C.high expense
D.acid property

4.單項選擇題"Scavenging" on a diesel engine means ().

A.injecting fuel oil into a cylinder
B.removing exhaust gases from the cylinder
C.forcing air into the cylinders under pressure after the exhaust valve has dosed
D.a combination of all the above

5.單項選擇題Scavenging is () of exhaust gases by blowing in fresh air.

A.the suction
B.the compression
C.the removal
D.the deliver