单项选择题

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

A.through bolts
B.dividing walls
C.sloping surfaces
D.relative angles

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单项选择题

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

单项选择题

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

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