单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
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
