单项选择题
A.defrosting B.de-oiling C.demulsifying D.dehumidifying
Precision engine bearing inserts are manufactured with ...
单项选择题Precision engine bearing inserts are manufactured with a small portion of the bearing ends extending beyond the bearing housing or capsThe installation process of these bearings requires sufficient （）.
A.overlap B.crush C.lap or lead D.protrusion
The usual method of effectively applying foam on a fire...
单项选择题The usual method of effectively applying foam on a fire is by （）.
A.spraying directly on the base of the fire B.flowing the foam down a vertical surface C.sweeping the fire before you with the foam D.spraying directly on the surface of the fire
During the inspection, the starting air valves should b...
单项选择题During the inspection, the starting air valves should be closed （）the engine from turning.
A.to increase B.to speed up C.to prevent D.to reduce
