单项选择题
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
A hot air start pipe indicates that there is （）.A.ineff...
单项选择题A hot air start pipe indicates that there is （）.
A.inefficient cooling B.a leaking air start valve C.a clogged drain valve D.a leaking air bottle
