Why are removable sleeves installed on centrifugal pump shafts?（）<br>A:They make it easier to replace the pump shaft packing<br>B:They can be economically replaced as they wear out<br>C:They can be removed when it is necessary to lighten the weight of the pump<br>D:They increase the strength of the shaft

Why are removable sleeves installed on centrifugal pump shafts?（）
A:They make it easier to replace the pump shaft packing
B:They can be economically replaced as they wear out
C:They can be removed when it is necessary to lighten the weight of the pump
D:They increase the strength of the shaft

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