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單項(xiàng)選擇題

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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單項(xiàng)選擇題

A lubricant often has to perform many duties in any situation, in addition to its fundamental job of （）.

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

單項(xiàng)選擇題

A level gauge for a tank is to （）.

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

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