单项选择题

A number of cylinder liners are enclosed in one cast iron casing to form a （）.

A.cylinder cover
B.cylinder block
C.cylinder frame
D.bed-plate

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单项选择题

A.tie rods
B.through bolts
C.lead wires
D.bearing caps

单项选择题

A.resisting oxidization
B.reducing friction
C.promoting moving speed
D.developing inertia

单项选择题

A.give the pressure
B.give the contents
C.give the shape of the tank
D.give the accuracy level