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單項(xiàng)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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單項(xiàng)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

單項(xiàng)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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