One of the main functions of wearing rings, as used in a centrifugal pump, is to （）.<br>A:maintain radial alignment between the pump impeller and casing<br>B:absorb all impeller shaft end thrust<br>C:prevent water leakage to the atmosphere<br>D:prevent wear of the pump casing and/or impeller

One of the main functions of wearing rings, as used in a centrifugal pump, is to （）.
A:maintain radial alignment between the pump impeller and casing
B:absorb all impeller shaft end thrust
C:prevent water leakage to the atmosphere
D:prevent wear of the pump casing and/or impeller

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