单项选择题
A.cylinder cover B.cylinder block C.cylinder frame D.bed-plate
A main bearing consists of two shells which are secured...
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
A lubricant often has to perform many duties in any sit...
单项选择题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
A level gauge for a tank is to （）.A.give the pressureB....
单项选择题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
