單項選擇題Smaller engines can be made more rigid than large ones and may not have （）.

A.connecting rods
B.crankshaft
C.crankcase
D.through bolts


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1.單項選擇題Since the burning or combustion takes place within the engine itself, the engine is known as （）.

A.a fire -tube boiler
B.an internal combustion engine
C.an external combustion engine
D.an internal combustion generator

2.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

3.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

4.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

5.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