单项选择题

A main bearing consists of two shells which are secured by means of studs and （）.

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

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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

单项选择题

A.inefficient cooling
B.a leaking air start valve
C.a clogged drain valve
D.a leaking air bottle