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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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